By Trevor Hunnicutt and Steve Holland WASHINGTON (Reuters) -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. The vast funding request includes over $20 billion for weapons, ammunition and other military assistance, as well as $8.5 billion in direct economic assistance to the government and $3 billion in humanitarian aid. “We need this bill to support Ukraine in its fight for freedom,” Biden said at the White House after signing the request on Thursda…