A Russian warship carried out a live-fire artillery exercise off the coast of Plymouth on Monday, the Ministry of Defence said.
The Russian frigate, Neustrashimy, was being shadowed by a Royal Navy ship and a French military aircraft during the operation, which lasted around 30 minutes.
The warship is understood to have informed the Royal Navy offshore patrol vessel HMS Tyne of its intentions ahead of time, the BBC reports.
The Independent approached the Ministry of Defence for comment.
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