Is your vessel, cargo or shipping company facing a sanctions investigation in Turkey? Learn about vessel detention, cargo holds, asset freezing, customs investigations, beneficial ownership, AIS activity and legal remedies for foreign shipowners and operators.

International sanctions have become one of the most serious compliance risks facing shipowners, vessel operators, charterers, managers and commodity traders using Turkish ports.

A vessel may arrive in Turkey for an apparently routine port call and suddenly face questions concerning its cargo origin, previous ports, beneficial ownership, charterers, counterparties, payment routes, AIS history or connections with sanctioned persons and entities.

The commercial consequences can develop rapidly. Cargo operations may be disrupted, banks may refuse payments, counterparties may suspend performance, authorities may request documentation and a vessel can face other restrictions depending on the legal basis of the investigation.

The risk is particularly significant because sanctions affecting international shipping do not arise from one universal legal system. A transaction may simultaneously involve Turkish sanctions rules, United Nations measures, foreign sanctions exposure, customs rules, anti-money laundering requirements, contractual sanctions clauses and banking compliance controls.

Turkey’s sanctions framework is primarily connected to United Nations obligations and domestic legislation including Law No. 6415 on the Prevention of Financing of Terrorism and Law No. 7262 on the Prevention of Financing the Proliferation of Weapons of Mass Destruction. MASAK plays an important role within the enforcement framework, while customs authorities implement customs-related restrictions. (Global Practice Guides)

For foreign shipping companies, the critical question is therefore not simply:

“Is the vessel itself on a sanctions list?”

The investigation can be much broader:

Who really owns the vessel? Who chartered it? Who owns the cargo? Where did the cargo originate? Who receives the payment? Has the vessel changed names or flags? Was AIS switched off? Were documents altered? Is a listed person indirectly benefiting from the transaction?

Why Maritime Sanctions Risk Has Increased

Shipping has become a major focus of international sanctions enforcement because vessels can be used to move oil, petroleum products, commodities and other goods through complex corporate and trading structures.

Recent international enforcement actions illustrate the scale of this risk. In July 2026, the U.S. Treasury announced sanctions involving more than 50 individuals, entities and vessels connected with an alleged illicit shipping network linked to Iranian oil exports and other commercial activity. (U.S. Department of the Treasury)

Foreign owners trading internationally therefore need to understand that a vessel may attract compliance attention because of much more than its current registered owner.

Historical activity can matter.

Can Turkey Investigate a Foreign-Flagged Vessel?

Yes.

A foreign flag does not prevent Turkish authorities from exercising powers available under Turkish law when a vessel enters Turkish jurisdiction.

Turkey actively conducts inspections of foreign vessels calling at its ports. According to the Ministry of Transport and Infrastructure, 3,115 foreign-flagged vessels underwent port-state inspections in 2025 and 486 were detained because of identified deficiencies. (T.C. Ulaştırma ve Altyapı Bakanlığı)

These figures concern port-state safety inspections rather than sanctions investigations specifically, but they demonstrate the substantial regulatory oversight exercised over foreign vessels visiting Turkish ports.

Foreign vessels are therefore not outside Turkish regulatory jurisdiction merely because they sail under another flag.

Which Authorities May Become Involved?

The authority involved depends on the suspected violation.

Potentially relevant institutions can include maritime and port authorities, customs authorities, prosecutors, law-enforcement bodies and financial-intelligence authorities.

MASAK can become particularly important where the investigation concerns financial flows, asset freezing, money laundering, terrorism financing or sanctions-related financial restrictions.

Turkey’s 2026 international-trade framework identifies MASAK as a key institution processing relevant foreign requests within the sanctions system. (Global Practice Guides)

Port Authority Investigation

A vessel may first encounter problems at port level.

Authorities may request or review documentation concerning:

the vessel,

flag,

classification,

ownership,

voyage history,

cargo,

crew,

and port operations.

Turkey maintains extensive port-state and flag-state inspection structures through its maritime administration. (Denizcilik Genel Müdürlüğü)

An operational inspection and a sanctions investigation should nevertheless be distinguished. The existence of a port inspection does not automatically mean the vessel is suspected of sanctions evasion.

Customs Investigation

Cargo is frequently the central issue.

Turkish customs authorities may examine:

cargo declarations,

country of origin,

shipper and consignee,

commercial invoices,

bills of lading,

customs classification,

transit documentation,

and supporting trade documents.

A sanctions-related concern can therefore develop from discrepancies in cargo documentation even where the vessel owner believes it has no involvement in the underlying sale.

Vessel Owner vs Cargo Owner

This distinction can be crucial.

The shipowner may not own the cargo.

A tanker may be carrying petroleum products owned by an international trader under a voyage charter.

If authorities investigate the cargo, the owner should establish immediately:

who owns the cargo, who chartered the vessel, who nominated the load port, who supplied the cargo documentation and what due diligence the owner performed.

The owner’s lack of cargo ownership does not necessarily prevent operational disruption to the vessel.

Charterer Sanctions Risk

Shipowners should screen charterers before fixing the vessel.

A sanctions investigation may focus on whether the charterer is:

directly designated,

owned or controlled by a designated person,

acting on behalf of another entity,

or involved in prohibited trade.

The charterparty’s sanctions clause becomes critical when these concerns arise.

Beneficial Ownership

Modern sanctions investigations frequently look beyond the company name appearing on the registry.

A vessel may be legally owned by a single-purpose company incorporated in one jurisdiction while the ultimate economic ownership lies elsewhere.

Investigators and compliance teams may examine:

registered owner,

ultimate beneficial owner,

shareholders,

directors,

commercial manager,

technical manager,

charterer,

and financing parties.

Complexity itself is not unlawful.

But deliberately obscuring ownership can create substantial compliance concern.

Recent Change of Ownership

Suppose a vessel is sold three months before arriving in Turkey.

The new owner is not designated.

However, the previous owner was connected with a sanctioned network.

Authorities or banks may investigate whether the transaction represented a genuine commercial sale or merely an attempt to conceal continuing control.

The foreign buyer should therefore preserve the complete acquisition file.

Vessel Name Changes

A vessel may change its name legitimately after a sale.

However, repeated name changes within short periods can attract scrutiny when combined with other risk indicators.

The investigation may examine the vessel’s IMO number because the IMO number generally provides continuity despite changes in vessel name.

Foreign owners should therefore conduct sanctions due diligence by IMO number, not merely current vessel name.

Flag Changes

Changing flag is also commercially normal.

But repeated or rapid flag changes combined with ownership restructuring, questionable trading patterns or documentation inconsistencies may generate enhanced scrutiny.

The owner should preserve documentation establishing legitimate reasons for any reflagging.

AIS Manipulation

AIS history has become an important sanctions-compliance issue.

Investigators may examine unusual periods where AIS transmissions disappeared, particularly around cargo loading, ship-to-ship transfers or calls at sensitive locations.

An AIS interruption does not automatically prove wrongdoing.

Technical failure, safety considerations and other legitimate explanations may exist.

But the owner should be able to document the reason for significant gaps.

Do Not Fabricate an Explanation for AIS Gaps

If an authority asks why AIS disappeared for 18 hours, the company should investigate before responding.

Relevant evidence may include:

bridge logs,

equipment fault reports,

master’s statements,

service reports,

satellite records,

and voyage data.

An inaccurate explanation can create a more serious credibility problem than the original AIS interruption.

Ship-to-Ship Transfers

Ship-to-ship (“STS”) transfers can attract enhanced sanctions scrutiny, particularly in commodity and petroleum trades.

Investigators may examine:

where the transfer occurred,

identity of the other vessel,

cargo origin,

cargo documentation,

AIS histories,

ownership of both vessels,

and commercial parties involved.

Foreign shipowners should preserve complete STS records.

Cargo Origin

The declared origin of cargo can become decisive.

For commodities subject to sanctions or trade restrictions, authorities may investigate whether documentation accurately reflects where the goods were produced, loaded or exported.

Potential evidence includes certificates of origin, terminal documentation, bills of lading, cargo manifests, invoices and inspection certificates.

False Bill of Lading

A sanctions investigation can escalate significantly if authorities suspect cargo documents were falsified.

For example, the bill of lading may identify one load port while technical or voyage records suggest another.

The shipowner should immediately determine who prepared and supplied the document.

The master should never be instructed to sign information known to be false.

Cargo Blending

Commodity blending can make origin analysis difficult.

Different petroleum products may be blended before shipment.

Where sanctions restrictions depend on origin, authorities may examine whether blending was used legitimately or as a mechanism to conceal the source of sanctioned commodities.

Documentation concerning suppliers, terminals, specifications and ownership should therefore be preserved.

Sanctioned Port Calls

Historical port calls can trigger questions.

A vessel may have visited a high-risk jurisdiction under previous ownership years earlier.

That does not automatically establish current liability.

The owner should distinguish between:

current conduct,

previous ownership,

lawful historical trading,

and activity that occurred before particular restrictions applied.

Vessel Purchased From a Sanctioned Owner

Buying a vessel previously associated with a sanctioned entity requires enhanced due diligence.

The buyer should examine:

seller identity,

beneficial ownership,

purchase price,

payment route,

release of mortgages,

sanctions status,

and whether the seller retained any hidden economic interest.

The objective is to establish that the transaction was genuine and did not leave a designated party with continuing ownership or control.

Banks May Freeze or Reject Payments

Sometimes the first indication of a sanctions problem comes from a bank rather than a Turkish authority.

Freight, hire, bunkers or sale proceeds may be blocked.

The bank may request extensive compliance information.

This can disrupt charterparty performance even without a formal Turkish government asset-freezing decision.

The distinction between private bank compliance action and an official Turkish freezing measure is important.

Asset Freezing in Turkey

Turkey’s domestic sanctions framework includes mechanisms for asset freezing in connection with designated persons and entities under applicable legislation and UN-related sanctions implementation.

Law No. 6415 and Law No. 7262 form important parts of this framework, and Turkish sanctions implementation gives a significant role to presidential decisions and MASAK. (Global Practice Guides)

Where an official asset freeze affects a shipping company, the precise decision and legal basis should be obtained immediately.

Can the Vessel Be Frozen?

A vessel is a high-value asset.

If an applicable Turkish asset-freezing decision legally reaches the owner or relevant property, the consequences can be severe.

But a vessel should not be assumed to be legally frozen simply because a bank, terminal, agent or commercial counterparty says there is a “sanctions problem.”

Foreign owners should determine:

Which authority issued the restriction?

What decision was made?

Which person or entity is designated?

Why is the vessel considered covered?

Is ownership or control being alleged?

Vessel Detention vs Asset Freeze

These concepts should not be confused.

A vessel may be unable to depart because of:

port-state detention,

judicial arrest,

criminal investigation,

customs measures,

administrative restrictions,

or sanctions-related asset freezing.

Each has a different legal basis and different remedy.

Identifying the correct measure is the first task for Turkish maritime counsel.

Criminal Investigation

Where authorities suspect falsified documents, sanctions evasion, smuggling, money laundering or other criminal conduct, the matter may move beyond administrative compliance.

A Turkish prosecutor may become involved.

The investigation can then include witness or suspect statements, documentary seizure, electronic evidence and financial investigation depending on the alleged offence and procedural decisions.

Company Managers

A corporate investigation can also create individual exposure.

Authorities may seek information from:

directors,

operations managers,

chartering managers,

masters,

agents,

and beneficial owners.

Individual criminal responsibility should never be assumed merely because a person holds a managerial title.

The investigation must establish the relevant person’s conduct, knowledge and applicable legal requirements.

Master of the Vessel

The master may be questioned about:

cargo documents,

voyage instructions,

AIS activity,

STS transfers,

bills of lading,

port calls,

and instructions received from owners or charterers.

The master should not speculate.

If the master does not know who ultimately owns a trading company or cargo, the appropriate response is not to guess.

Document-based answers are preferable.

Crew Members

Crew members may also be interviewed.

The company should preserve their legal rights while avoiding any attempt to influence testimony.

Internal investigations should be conducted carefully where criminal proceedings are possible.

Search of Vessel Documents

Authorities may request or, where legally authorized, obtain documents relevant to an investigation.

Potentially relevant records include:

logbooks,

cargo documents,

charterparty,

communications,

AIS records,

technical logs,

ownership documents,

and payment-related information.

The company should preserve records immediately once an investigation becomes known.

Electronic Evidence

Emails and electronic communications can become particularly important.

Investigators may examine whether personnel knew that:

the cargo had a different origin,

the counterparty was sanctioned,

AIS was intentionally disabled,

documents were inaccurate,

or the vessel was participating in an evasive structure.

A sanctions-compliance investigation should therefore be treated as a serious document-preservation event.

Do Not Delete Communications

Once an investigation begins, destroying or altering records can significantly worsen the company’s position.

Issue an internal preservation instruction covering relevant emails, messages, chartering files, voyage records and compliance documentation.

Preservation should include both exculpatory and potentially problematic material.

Internal Sanctions Due Diligence

One of the strongest defenses is evidence that the company operated a genuine sanctions-compliance system.

The owner should be able to demonstrate screening of:

registered owners,

beneficial owners,

charterers,

cargo interests,

banks,

brokers,

and other relevant counterparties.

Screening should not be treated as a one-time exercise performed only when the charterparty is signed.

Ongoing Screening

Sanctions lists change.

A counterparty may be clear when the charter begins but become designated during the voyage.

For higher-risk trades, screening should therefore continue at appropriate stages throughout the transaction.

Sanctions Clause in the Charterparty

The charterparty should allocate sanctions risks clearly.

Important issues include:

right to refuse unlawful orders,

right to request alternative employment,

termination,

payment difficulties,

sanctioned cargo,

sanctioned ports,

and allocation of resulting delay.

The exact wording can determine whether the owner or charterer bears substantial commercial losses.

Charterer Orders Vessel to High-Risk Port

Suppose the charterer orders the vessel to a destination that the owner believes creates sanctions exposure.

The owner should not simply refuse without reviewing the charterparty.

The sanctions clause, employment provisions and applicable legal restrictions must be examined.

An unjustified refusal can itself create a charterparty dispute.

P&I Club Notification

The P&I Club should generally be notified promptly where a sanctions investigation threatens vessel operations or creates third-party liability issues.

Clubs maintain detailed sanctions-compliance procedures because sanctions can affect cover and the ability to make payments.

The owner should avoid assuming that insurance will respond normally where sanctions restrictions prohibit payment.

Hull Insurer and Mortgagee

A serious sanctions investigation may also concern hull insurers and financing banks.

Loan agreements commonly contain sanctions representations and events-of-default provisions.

A detention or designation issue can therefore create financing consequences beyond the immediate Turkish investigation.

Bunker Supplier Risk

Sanctions exposure can also arise through bunker transactions.

Owners should screen relevant suppliers and payment recipients, particularly in higher-risk jurisdictions.

A vessel may otherwise become involved in disputed transactions even where the cargo itself is unproblematic.

Vessel Agent in Turkey

The Turkish agent can become a critical operational contact when authorities request documentation.

However, the agent should not make substantive legal admissions on behalf of the foreign owner without authority.

Sensitive responses concerning beneficial ownership, cargo origin or alleged sanctions connections should be coordinated with legal counsel.

Port-State Detention Is a Separate Risk

Turkey has an active foreign-vessel inspection regime. Official Turkish data show 3,115 foreign-flagged vessels were inspected in 2025, with 486 detained for identified deficiencies. (T.C. Ulaştırma ve Altyapı Bakanlığı)

Port authority guidance also recognizes formal outcomes including vessel detention where deficiencies require it. (Aliağa Liman Başkanlığı)

A vessel already facing sanctions scrutiny should therefore continue to maintain full technical and documentary compliance. A separate PSC detention can make an already difficult situation substantially worse.

Commercial Consequences of a Sanctions Investigation

Even before liability is established, the owner may experience:

loss of charter hire,

cargo delays,

port expenses,

crew costs,

banking restrictions,

insurance problems,

financing concerns,

and reputational damage.

Counterparties may also invoke sanctions clauses.

The owner should document these losses from the first day.

Can the Owner Claim Compensation for Wrongful Restrictions?

Potentially, depending on the nature of the restriction, responsible party and applicable legal requirements.

However, compensation is not automatic simply because an investigation ultimately closes without charges.

A private charterer’s refusal to perform, a bank compliance hold, an administrative measure and an unlawful judicial restriction are legally different situations.

Each must be analyzed separately.

Foreign Sanctions vs Turkish Law

This distinction is essential.

Turkey does not simply reproduce every sanctions regime adopted by every foreign jurisdiction.

Turkey’s sanctions system is strongly connected with UN Security Council obligations and its own domestic legislation. (Global Practice Guides)

However, foreign sanctions can still have enormous commercial consequences.

A Turkish bank, international insurer, charterer or correspondent bank may have its own compliance obligations or risk policies.

Therefore:

“This foreign sanction is not automatically Turkish law”

does not necessarily mean:

“This sanction has no effect on the transaction.”

OFAC Sanctions

U.S. sanctions can create significant exposure for shipping transactions involving U.S. persons, U.S.-linked payments or other relevant jurisdictional connections.

Even outside direct legal jurisdiction, international banks and insurers may treat OFAC designation as a serious commercial risk.

Recent 2026 U.S. Treasury measures again demonstrate the continuing focus on vessels, shipping companies and networks allegedly used to transport Iranian petroleum and other commodities. (U.S. Department of the Treasury)

European Union Sanctions

EU sanctions may similarly affect European owners, charterers, banks, insurers and trading counterparties.

For example, the EU adopted additional sanctions measures concerning Iranian actors in June 2026, illustrating how sanctions affecting maritime activity can evolve rapidly. (Anadolu Ajansı)

Foreign owners should therefore identify all jurisdictions connected with the voyage rather than checking only Turkish rules.

High-Risk Red Flags

Certain patterns deserve enhanced investigation:

frequent ownership changes,

rapid flag changes,

unexplained AIS gaps,

unusual STS activity,

inconsistent cargo origin documentation,

opaque beneficial ownership,

recent company formation,

payments through unrelated third parties,

and substantial inconsistencies between voyage and commercial documents.

No single factor automatically proves sanctions evasion.

The risk arises from the overall factual pattern.

Practical Example: Vessel Linked to Previous Sanctioned Owner

A foreign investor purchases a tanker six months before its Turkish port call.

Turkish counterparties raise concerns because the previous beneficial owner was sanctioned.

The new owner should produce evidence demonstrating genuine acquisition, payment of market consideration, transfer of ownership and absence of continuing control by the former owner.

Practical Example: Suspicious AIS Gap

A tanker arrives in Turkey.

Authorities identify a 20-hour AIS gap near an STS area.

The owner should immediately obtain bridge logs, equipment reports, satellite data and operational instructions.

If the AIS interruption resulted from technical failure, contemporaneous documentation can be crucial.

Practical Example: Cargo Origin Dispute

A vessel carries petroleum products under a charterparty.

Documents identify one origin, while authorities suspect that the cargo originated elsewhere.

The owner should preserve the charterer’s voyage orders, bills of lading, terminal documents, certificates of origin and due-diligence records.

The owner should also establish precisely what information it possessed when accepting the voyage.

Practical Example: Bank Freezes Freight

A shipowner completes a voyage but its bank refuses incoming freight because the charterer’s ownership structure triggers sanctions screening.

The first step is determining whether this is an official government freeze or the bank’s internal compliance hold.

The legal and commercial remedies differ significantly.

First 24 Hours of a Maritime Sanctions Investigation in Turkey

The foreign shipowner should immediately establish the exact legal basis and authority responsible for the investigation or restriction.

The company should preserve the vessel’s ownership documents, charterparty, bills of lading, cargo documentation, AIS records, logbooks, STS records, payment documents, counterparty screening and communications.

The registered and beneficial ownership of the vessel, charterer and relevant cargo interests should be independently verified.

No records should be deleted or altered.

The master and shore management should receive coordinated instructions concerning document preservation and communications with authorities.

The P&I Club and relevant insurers should be notified where appropriate.

Turkish counsel should determine whether the vessel faces an official detention, customs hold, criminal investigation, judicial measure or asset-freezing decision.

The objective is to answer four questions quickly:

What is being investigated? Who is the target? What legal measure currently restricts the vessel or funds? What evidence can demonstrate lawful conduct?

Frequently Asked Questions

Can Turkey investigate a foreign-flagged vessel for sanctions-related activity?

Yes. Foreign flag status does not prevent Turkish authorities from exercising powers available under Turkish law while the vessel is within Turkish jurisdiction.

Does Turkey automatically enforce every U.S. or EU sanction?

No. Turkey has its own legal sanctions framework, strongly connected with UN obligations and domestic legislation. Foreign sanctions may nevertheless create major banking, insurance and contractual consequences. (Global Practice Guides)

Can a vessel be detained during a sanctions investigation?

Potential restrictions depend on the legal basis being used. A sanctions-related asset freeze, customs measure, criminal judicial measure and ordinary port-state detention should be distinguished carefully.

Can authorities investigate beneficial ownership?

Beneficial ownership can be highly relevant where the issue is whether a designated person indirectly owns or controls an entity or asset.

Can previous vessel ownership create sanctions problems?

Yes, it can trigger enhanced scrutiny. However, previous association with a sanctioned owner does not by itself establish that the current owner is violating sanctions.

Is an AIS gap proof of sanctions evasion?

No. An AIS gap can have legitimate explanations. But unusual gaps, particularly around sensitive cargo operations or STS transfers, may lead to further investigation.

Can the master be questioned?

Potentially. The master may hold relevant information concerning voyage orders, cargo documentation, AIS operation and ship-to-ship transfers.

Should the owner notify its P&I Club?

Generally, prompt notification should be considered where the investigation could affect vessel operations, liability or insurance coverage.

What documents should the owner preserve?

Ownership records, charterparties, bills of lading, cargo documents, voyage instructions, AIS data, logbooks, STS records, bank documentation, counterparty screening and relevant communications should be preserved.

What should a foreign shipowner do first?

Determine exactly which Turkish authority is acting, what legal measure has been imposed and why the vessel, company, cargo or transaction is considered connected to the sanctions concern.

Maritime Sanctions Lawyer in Turkey

A maritime sanctions investigation can move rapidly from a compliance inquiry into a serious operational, financial and criminal-law problem.

Foreign shipowners should therefore avoid responding only at the level of individual document requests.

The entire transaction should be reconstructed:

Who owns and controls the vessel? Who chartered it? Who owns the cargo? Where did the cargo originate? Which ports were called? Were there STS transfers? Are AIS records complete? Which banks handled payment? What sanctions screening was conducted before the voyage?

The legal basis of any Turkish restriction must then be identified precisely.

An official asset freeze is different from a bank compliance hold. A customs measure is different from judicial ship arrest. A port-state detention is different from a criminal investigation.

This distinction determines the correct remedy.

Turkey’s active oversight of foreign vessels also means that regulatory preparedness is essential. Official figures show that Turkish authorities conducted port-state inspections on 3,115 foreign-flagged vessels during 2025, with 486 detained for identified deficiencies. (T.C. Ulaştırma ve Altyapı Bakanlığı)

For foreign shipping companies operating in higher-risk trades, sanctions compliance should therefore begin before the vessel enters Turkish waters, not after an investigation starts.

Fırat Fesih Kaya Law Office assists foreign shipowners, vessel operators, managers, charterers, shipping companies and international investors with maritime sanctions investigations in Turkey, vessel detention, asset freezing, customs investigations, cargo holds, beneficial ownership investigations, AIS and STS issues, sanctions compliance, criminal investigations, emergency vessel-release strategies and maritime litigation.

Phone: +90 312 434 22 22
Mobile: +90 532 769 22 22
Email: info@firatfesihkaya.av.tr
Address: Mevlana Boulevard No: 221, Yıldırım Tower, Balgat, Çankaya, Ankara, Turkey