Footage captured in the Bosphorus shows British destroyer HMS Duncan and Canadian frigate HMCS Toronto heading to the Black Sea. The vessels are en route to the Ukrainian port of Odessa for naval drills, as well as 30 other ships and 30 different types of various aircraft.
Addressing the issue, Russian military stated that Black Sea Fleet has been employed to monitor the ships.
Moscow has repeatedly accused NATO of illegally expanding eastward in violation of its promises. NATO has been building up its military on Russia's eastern flank, placing troops in the Baltic States and Poland in 2017, while US and UK warships have been routinely calling on Black Sea ports.