Almost 200 sanctioned Russia-linked ships have entered UK waters despite warning

The article was published on May 12, 2026, summarising the policy, the 8 April 2026 entry into UK waters, and ongoing monitoring of the shadow fleet.

Tracking data shows a shadow fleet tanker entered UK waters in the early hours of 8 April 2026 before transiting the English Channel, reportedly escorted by a warship.

Professor Alessio Patalano of King's College London said the presence of a warship escort suggested pressure on Russia; shipping lawyer James M Turner KC noted that legal constraints may limit boarding and seizure if a tanker is properly flagged, indicating the policy may be difficult to apply in some cases.

Tracking shows the shadow fleet's activity included crossings into the UK's Exclusive Economic Zone and, in at least 94 instances, brief incursions into UK territorial waters. Most ships tracked were oil tankers (173), with 10 LNG tankers and 1 multipurpose offshore vessel.

Yi Tong, registered to Pacific Shipmanagement in Shandong, took a longer route around Ireland and the north of Scotland in April 2026, avoiding the English Channel and the UK's territorial waters.

Sir Keir Starmer announced that British armed forces 'are now able to board sanctioned vessels that are passing through our waters'.

The Ministry of Defence said it had challenged more than 700 suspected shadow fleet vessels since October 2024 as part of disruption and deterrence.

The article notes Kremlin criticism of the UK's threat to detain Russian vessels as 'another deeply hostile step' with potential consequences. It discusses possible legal constraints on boarding or seizing sanctioned ships and cites a shipping-lawyer on flag-related limitations, along with the MoD's stance on 'disrupting and deterring' the shadow fleet and data gaps in MarineTraffic AIS readings.

Tracking data shows a Russia-linked oil tanker entered UK waters in the early hours of April 8, 2026, before transiting the English Channel.

The Yi Tong, registered to Pacific Shipmanagement (Shandong), took a longer route around Ireland and the north of Scotland in April 2026, avoiding the Channel and UK territorial waters.

Sir Keir Starmer announced that British armed forces 'are now able to board sanctioned vessels that are passing through our waters'.

Yi Tong travelled to and from the Port of Ust-Luga in north-west Russia to China via the English Channel, illustrating past use of the Channel by ships linked to Russia.

The Ministry of Defence said it has disrupted and deterred more than 700 suspected shadow fleet vessels since October 2024 as part of sanctions enforcement against Russia's oil shipments.