The plan, backed by 300 billion pounds ($400 billion) in funding over four years, is part of a drive toward a more "European NATO" and will help the British forces deter the Russian threat, outgoing U.K. Prime Minister Keir Starmer said.

The prime minister is expected to publish the Defence Investment Plan soon

The U.K. is learning from Ukraine’s war against Russia to build its own armed forces to prepare for a similar conflict this decade.