A Russian spy ship on the edge of U.K. waters pointed lasers at British pilots for the first time in a "deeply dangerous” escalation, Defense Secretary John Healey revealed as he warned of military options if the vessel travels further.

Yantar — designed to gather intelligence and map Britain’s undersea cables — entered U.K. wider waters over the last few weeks and is currently located north of Scotland, Healey told a media briefing on Wednesday in Downing Street. It was the second time this year that the ship had been deployed to U.K. waters.

Healey said a Royal Navy frigate and maritime patrol aircraft will track the vessel and Britain stands "ready” if it travels south this week. The lasers appeared designed to distract British surveillance aircraft.