Starmer, a cautious center-left politician, has avoided directly contradicting Trump or criticizing his actions. The U.K. joined the U.S. in refusing to sign a joint declaration at an Artificial Intelligence summit hosted by Macron in Paris this month in what was seen as an attempt to curry favor with Washington.

LONDON — The leaders of France and Britain are making tag-team visits to Washington this week as Europe attempts to persuade President Donald Trump not to abandon Ukraine in pursuit of a peace deal in the three-year-old war with Russia.

President Donald Trump holds talks this week with French President Emmanuel Macron and British Prime Minister Keir Starmer at a moment of deep uncertainty about the future of transatlantic relations