WASHINGTON (Reuters) - The White House expects other countries to step up and continue to provide a range of assistance to Ukraine, press secretary Jen Psaki said on Thursday.

       "Other countries, we expect them to step up as well as this is going to be a sustained effort," Psaki said.

       Earlier in the day, President Joe Biden asked Congress for $33 billion to support Ukraine - a dramatic escalation of U.S. funding for the war with Russia - and for new tools to siphon assets from Russian oligarchs.

       (Reporting by Steve Holland and Nandita Bose in Washington)