London — Britain warned Russia on Wednesday that it was ready to deal with any incursions into its territory after the spy ship Yantar was detected on the edge of U.K. waters north of Scotland.

Defense Secretary John Healey said the Russian vessel had directed lasers at pilots of surveillance aircraft monitoring its activities.

"This is the first time we've had this action from Yantar directed against the British RAF. We take it extremely seriously," Healey said, according to the Reuters news agency.

"My message to Russia and to Putin is this: We see you. We know what you're doing,'' Healey said during a briefing in London. "And if the Yantar travels south this week, we are ready."

"We have military options ready should the Yantar change course," Reuters quoted him as saying.

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