A Russian naval frigate fired its main cannon in a short-notice exercise approximately 45 miles south of Plymouth on Monday, in what British defence officials described as an unusually provocative display of military activity close to UK waters. The drill, lasting around 30 minutes and beginning at about 9:30am, took place in international waters and was legal under maritime law — provided adequate safety warnings are given — but British defence sources said they could not recall the last time a Russian warship had conducted such a test so close to the British coast.

The vessel involved, the Neustrashimy, is a 130-metre Russian frigate armed with a 100mm cannon capable of firing 50 rounds per minute at a range of 20 kilometres, as well as anti-ship cruise missiles and Gatling rotary guns for air defence. The ship gave short notice of its intention to fire and asked HMS Tyne, the British Royal Navy patrol vessel that had been shadowing it, to withdraw to a safe distance of about five miles. A French military aircraft also made contact with the Russian vessel to ask about the purpose of the exercise. The Neustrashimy has since moved east of the Isle of Wight and is now being tracked by HMS Mersey.

The timing drew significant attention: Monday was the day Andy Burnham was sworn in as the new British prime minister, and was also the first full day in office for Wes Streeting as defence secretary. Whether Russia deliberately timed the exercise as a signal to the incoming government has not been confirmed or denied by British authorities, though Streeting called the manoeuvre