Defense minister John Healey said on Wednesday Britain had committed 150 million pounds ($205 million) to the so-called Prioritized Ukraine Requirements List (PURL) initiative to supply Ukraine with U.S. weapons.

PURL was set up last summer to keep U.S. weapons flowing to Ukraine at a time when new U.S. military assistance had stalled.

“I’m pleased to confirm the UK is committing £150 million to PURL,” Healey said in an emailed statement.

“Together we must provide Ukraine with the critical air defense it needs in response to Putin’s brutal onslaught.”

The scheme allows allies to fund purchases of American air-defense systems and other critical equipment for Kyiv.

Allies have already put forward over $4.5 billion through the program, U.S. ambassador to NATO Matthew Whitaker said on Tuesday.

($1 = 0.7323 pounds)

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(Reporting by Sam Tabahriti; editing by William James)