Sir Keir Starmer has said Britain is committed to Ukraine being on an “irreversible path” to joining Nato after the US appeared to rule out membership for the war-torn country.The Prime Minister bolstered his backing for Kyiv in a phone call with President Volodymyr Zelensky as global leaders gather in Munich for a major security conference.

President Volodymyr Zelenskiy said Ukraine would need the U.S. to help it build up an army as big as that of Russia to serve as a "Plan B" if his country is not admitted into the North Atlantic Treaty Organization.