Maritime Security Report: 24 - 31 May 2026
- Palaemon Maritime
- 4 days ago
- 6 min read
This week saw fifteen maritime security incidents, with heightened activity in major
maritime corridors globally, including: Black Sea, Gulf of Aden, Gulf of Finland, Gulf of
Guinea, Gulf of Oman, and the Strait of Hormuz.
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Executive Summary
Europe
Ukraine Route Struck: Russian air and underwater drones hit five ships, including four foreign cargo vessels bound for Turkey and a vessel inside Odessa Port.
Russian Targets Hit: Ukrainian drones struck a ship in occupied Berdyansk, a Russian oil depot, and three shadow fleet tankers off Turkey.
Hull Mines Defused: Russian divers disarmed two 7kg magnetic mines found on a Liberian LPG carrier anchored at Ust-Luga.
Gulf of Guinea:
Robbery: Ivory Coast Supply Vessel Robbed: Robbers boarded an anchored, Antigua and Barbuda-flagged offshore supply vessel at Abidjan inner anchorage.
Northwest Indian Ocean
U.S.–Iran Clashes & Restrictions: U.S. forces hit Iranian drone and mine sites. Iran retaliated against a U.S. base in Kuwait. Ships were ordered to avoid the TSS of the Strait of Hormuz.
Hormuz & Oman Mine Threats: A tanker was damaged by an explosion off Muscat, while multiple navies issued urgent alerts over a floating naval mine spotted in Omani shipping lanes.
Piracy & Asymmetric Risks: Regional forces countered ongoing threats, successfully foiling a pirate attack on a merchant vessel and evading an armed skiff approach near Yemen
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Key Incidents by Region
Northwest Indian Ocean
30 May 2026
The Gambia-flagged cargo vessel, M/V Lian Star, was confirmed to be hit by U.S. CENTCOM after failing to comply to more than 20 distinct warnings. A U.S. military aircraft fired an AGM-114 Hellfire missile at the ship’s engine room successfully disabling its propulsion leaving it adrift and ending its transit to Iran. No immediate injuries or fatalities were reported.
30 May 2026
Oman MRCC reports a vessel sighted a mine inshore Omani TTW in the Strait of Hormuz in the vicinity of position 26°24’N 056°20’E. Vessels operating in the area are advised to maintain a safe distance from any suspicious floating objects and steer clear of the aforementioned coordinates. Report any relevant sightings or information to MSCIO and UKMTO.
29 May 2026
The Joint Maritime Information Center (JMIC) reported on behalf of the U.S. military, that the U.S. will be conducting operations North of the Musandam peninsula in the Strait of Hormuz. All mariners are advised by the JMIC to avoid the TSS of the SoH, coordinate transit attempts with U.S. Naval Cooperation and Guidance for Shipping (NCAGS), and navigate in accordance with COLREGS.
28 May 2026
A tanker was approached by a skiff 85NM south off the coast of Yemen, within the Internationally Recommended Transit Corridor. The skiff closed to within 3nm of the vessel’s portside. The tanker conducted evasive maneuvers and the armed security team deployed to the bridge wing, whilst also activating the fire hoses. The PAG was unsuccessful and aborted their attempt.
28 May 2026
OSINT reports suggest that US forces conducted strikes on Iranian military positions at Bandar Abbas, whilst also shooting down 4 Iranian one-way attack drones over the SoH. U.S. forces also struck a ground control station that was preparing a launch of a fifth drone. Reports indicate that the drones were targeting a US tanker transiting outbound with AIS switched off. Iran’s IRGC responded to the interception by launching another strike towards a US military base in Kuwait, however, Kuwaiti air defences managed to intercept the missile and drone threats.
27 May 2026
The Indian Navy Kolkata-class destroyer, INS Kolkata, foiled a suspected piracy attempt in the vicinity of the m/v Mashallah 1 near the Gulf of Aden. The vessel was able to swiftly respond to the treat and deter an attack. The intervention involved a helicopter and a boarding team.
26 May 2026
The UKMTO reported an attack on a tanker 60nm East of Muscat, Oman. The vessel suffered an external explosion portside aft close to the waterline. Additional reports mention that some bunker fuel discharged into the sea, however no crew was injured in the attack. Authorities are investigating, and all vessels are advised to transit with caution. Report any suspicious activity to UKMTO and MSCIO.
25 May 2026
U.S. forces conducted airstrikes on multiple locations in Southern Iran. According to U.S. CENTCOM, the strikes targeted Iranian missile sites, and IRGC boats that were attempting to place maritime mines in the SoH. The locations of the targets included the Bandar Abbas area and Larak Island.
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Europe
30 May 2026
A merchant vessel was struck by an Unmanned Aerial Vehicle (UAV) in Berdyansk Port, Russia. This attack was part of a highly active Ukrainian drone campaign over the weekend. OSINT networks note that this marks the third vessel hit in the immediate Berdyansk port area within a two-week span.
30 May 2026
Ukrainian armed forces conducted a uav attack on the JSC oil depot in Feodosia, Crimea. This facility is a highly strategic hub used by the Russian military to store, manage and distribute fuel to the Black Sea Fleet and occupation forces in Southern Ukraine. Local residents reported hearing a string of explosions followed by a large fire at the depot. Satellite tracking confirms fuel storage tanks and loading infrastructure was hit.
28 May 2026
Three foreign commercial vessels, sailing under the flags of Vanuatu, Comoros Islands and Panama, were hit by Russian UAVs in Ukraine’s maritime corridor. Fires broke out in all three vessels, but were extinguished by their crews. Two crewmembers of the Vanuatu-flagged vessel were injured and evacuated by Ukrainian Navy vessels to a medical facility. The vessel was also towed to port for repairs, disrupting its voyage to Türkiye.
28 May 2026
Three oil tankers belonging to Russia’s shadowfleet were attacked by waterborne USVs approximately 50 miles off the coast of Northern Türkiye. No injuries were reported amongst the crew. The extent of the damage remains unknown.
26 May 2026
OSINT reports indicate an explosion occurred on a Ukrainian-flagged sailing boat whilst berthed in Odessa port, Ukraine. The explosion could have been caused by an unmanned underwater vehicle. The extent of the damage or casualties were not reported upon.
25 May 2026
Two magnetic mines were discovered attached to the hull of a Liberian-flagged LPG carrier during a security inspection whilst anchored off Ust-Luga, Russia. Russian security service divers discovered the magnetic devices attached to the hull in the area of the engine room. Each mine contained seven kilograms of explosives. The vessel had departed from Antwerp on 16 May 2026 with no intermediary stops. The crew were evacuated as a precaution, and the mines were disarmed.
Gulf of Guinea
28 May 2026
An Antigua and Barbuda-flagged offshore supply vessel was robbed whilst anchored at Abidjan inner anchorage, Ivory Coast. No further details regarding the number of perpetrators, weapons used or items stolen are currently available.
Threat Outlook
Region | Threat Level | Assessment |
Europe | Very High | The Black Sea remains highly dangerous for commercial shipping as a target for subsea, surface and aerial drones. Vessels traversing the Baltic sea route to Russia, also seem to have elevated risk. |
Gulf of Guinea | Low | Anchorages remain high risk of petty theft and robbery. |
Northwest Indian Ocean | Very High | This week marked a severe escalation in the Hormuz conflict, with both U.S. and Iranian military strikes involving commercial shipping. |
Operational Guidance
Operators should:
Watch for Drones & Mines: Maintain sharp lookouts for UAVs, waterborne drone boats, and floating naval mines in the Black Sea and Strait of Hormuz.
Inspect Hulls & Anchorages: Conduct security checks at anchor at Ust-Luga and the Gulf of Guinea to counter magnetic hull mines and boardings.
Obey Chokepoint Restrictions: Avoid the Strait of Hormuz Traffic Separation Scheme and coordinate all transits directly with U.S. naval forces (NCAGS).
Deploy Active Deterrence: Use armed guards, fire hoses, and evasive maneuvers to repel small-craft and pirate approaches in the Gulf of Aden.
Monitor Security Broadcasts: Maintain a continuous watch on VHF Channel 16 and closely track UKMTO, JMIC, and local NAVWARN alerts.
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