The British defense secretary told Parliament that the Yantar, which he described as a Russian spy ship, had come near Britain’s coast for the second time in a few months.

A British official sent a public warning to Russian President Vladimir Putin on Wednesday after the Royal Navy started tracking the Russian spy vessel Yantar in British waters this week.

The Royal Navy has been monitoring a Russian spy ship after it entered British waters, the defence secretary has told MPs. John Healey said the vessel, Yantar, was used for gathering intelligence and mapping the UK's critical underwater infrastructure. He said the incident was "another example of growing Russian aggression".

Defence Secretary John Healey said Russia "remains the most pressing and immediate threat to Britain", and added that "any threat will be met with strength and resolve".

U.K. Defense Secretary John Healey told British lawmakers on Tuesday that a Russian spy ship entered British waters this week, the BBC reports.

Defence Secretary John Healey said Russia "remains the most pressing and immediate threat to Britain", and added that "any threat will be met with strength and resolve".

Britain’s defence minister has warned Russian President Vladimir Putin that “we will not shy away from robust action” after telling Parliament that a Russian spy vessel had been operating in UK waters this week.