Sir Keir Starmer has reaffirmed the UK will continue to back Ukraine's "irreversible path" to joining Nato despite leading figures in President Donald Trump's administration appearing to rule out membership.
The prime minister told Ukraine's President Volodymyr Zelensky he stood by a pledge - made alongside ex-US president Joe Biden at last year's Nato summit in Washington - to support Ukraine's bid for membership.
Sir Keir and Zelensky spoke on the phone ahead of a global leaders' meeting at the Munich Security Conference.
Sir Keir's comments are in stark contrast to those of the Trump administration, which has said this week that Nato membership for Ukraine is not a "realistic prospect".