British Prime Minister Andy Burnham is handing Ukraine the blueprints to a valuable piece of his country’s military technology, thumbing his nose at a Kremlin that says the United Kingdom is now a party in the conflict.

The premier, who visited Ukraine for the first time on Monday to meet with President Volodymyr Zelensky, is handing over data to produce Storm Shadow missiles. Despite rapidly deteriorating relations with Russia, Burnham has doubled down on the U.K.’s support for Kyiv — claiming his government is prepared to back the Ukrainian forces to the hilt.

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