The U.S. is refusing to provide air defenses to back the ¡°reassurance force¡± the U.K. and France are planning in a postwar Ukraine, people familiar with the matter said.

British Prime Minister Keir Starmer has insisted a U.S. so-called backstop is essential to deter Russia from breaching any future ceasefire deal. But European allies have concluded during discussions with their American counterparts that President Donald Trump won¡¯t provide the guarantees they have sought to back the Europe-led ¡®coalition of the willing,¡¯ according to the people, who requested anonymity disclosing private discussions.

The U.K. government declined to comment. The White House didn¡¯t immediately respond to a request for comment.