UK Monitors Russian Spy Ship Near Territorial Waters, Defense Secretary Issues Warning

LONDON, England — November 20, 2025 — British authorities confirmed Wednesday that the Russian spy ship Yantar is operating near the edge of the United Kingdom’s territorial waters, prompting a coordinated response involving allied naval forces. Officials said the U.K. is actively shadowing the vessel to monitor its movements and maintain maritime security.

The Ministry of Defence stated that the Yantar, known for its intelligence-gathering capabilities, has been detected close to British maritime zones, raising concerns about potential surveillance activities. In response, the U.K. has deployed naval assets alongside allied partners to track the ship and ensure it does not enter British territorial waters.

Defense Secretary James Cartwright issued a firm warning directed at Russian President Vladimir Putin, emphasizing that the U.K. will take all necessary measures to protect its sovereignty and maritime interests. “We are fully prepared to respond to any actions that threaten our national security,” Cartwright said in a statement released by the ministry.

The Yantar has a history of operating in international waters near various countries, often drawing scrutiny for its intelligence missions. Its presence near the U.K. comes amid heightened geopolitical tensions between Russia and Western nations, particularly concerning surveillance and military posturing in strategic maritime regions.

British officials highlighted that the operation to shadow the Yantar is part of ongoing efforts to maintain situational awareness and deter any incursions into protected waters. Allied naval forces, including vessels from NATO member states, are participating in the monitoring mission to demonstrate a unified stance against potential provocations.

The U.K. government reiterated its commitment to upholding international maritime law and safeguarding its territorial boundaries. Authorities noted that while the Yantar remains in international waters, close to but outside the 12-nautical-mile limit that defines British territorial seas, its proximity warrants vigilance.

This development follows a series of recent encounters involving Russian naval and intelligence vessels near European waters, which have prompted increased surveillance and defensive measures by NATO countries. Analysts suggest that such maneuvers are part of Russia’s broader strategy to assert influence and gather intelligence in contested regions.

The Ministry of Defence declined to provide detailed information about the specific capabilities of the Yantar or the exact nature of the intelligence it may be collecting. However, officials emphasized that the U.K. and its allies are equipped to respond swiftly to any escalation.

The situation remains fluid, with British and allied forces maintaining a close watch on the vessel’s movements. Authorities have urged calm and stressed that diplomatic channels remain open to address any concerns arising from the incident.

The presence of the Yantar near the U.K. underscores ongoing challenges in maritime security and the importance of international cooperation in monitoring and responding to potential threats in critical sea lanes.