LONDON — British Prime Minister Keir Starmer announced billions in support for Ukraine on Sunday following a summit with European leaders, just days after President Donald Trump berated Ukrainian President Volodymyr Zelenskyy in the Oval Office.

Starmer announced a loan of 2.2 billion British pounds ($2.8 billion) to support Ukraine, funded through the freezing of Russian assets passed on Saturday. He also highlighted a new deal that would allow Ukraine to use 1.6 billion pounds ($2…