Russian President Vladimir Putin’s forces dramatically escalated their shadow war against NATO on Wednesday, with the U.K. warning “military options” were on the table after a spy ship blinded air force pilots with lasers.

The Russian spy ship Yandar was spotted lurking off the coast of Scotland, prompting a military response, Defense Secretary John Healey said.

When British Royal Air Force jets were deployed to monitor the ship and move it on its way, the Yantar crew responded by flashing lasers at the aircraft, either to “interfere with the pilots, or let us know they see us watching,” a military source told The Times.

The incident was met with fury by the British government, which announced they were changing the naval rules of engagement in response to the incursion.

Healy warned,

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