"We see you." That was UK Defence Secretary John Healey’s defiant warning to Russia's President Vladimir Putin after his spy ship was spotted in UK waters this week. The ship, known as Yantar, is operated by a Russian Ministry of Defence agency and officially carries out oceanographic research.

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.

The United Kingdom has confirmed that one of its Royal Navy nuclear-powered submarines surfaced close to the Yantar, a notorious Russian spy ship late last year, to make it clear it was being observed.