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By Bernd Debusmann Jr on Capitol Hill & Sam Cabral
BBC News, Washington
Ukrainian President Volodymyr Zelensky has urged US lawmakers to back more aid to Kyiv, but his in-person plea appears to have changed few, if any, minds.
Mr Zelensky met with leaders in Washington DC in a bid to prevent $61bn (£49bn) in aid from being sidelined in a standoff over US border policy.
Appearing with him at the White House, President Joe Biden said Congress must "compromise" and "prove Putin wrong".
But members of Congress told the BBC nothing had changed after the talks.
It was Mr Zelensky's third visit to the nation's capital since Russia invaded his country in February 2022.
Unlike his previous two visits, there was no red carpet entrance or ceremonial fanfare, reflecting the pessimism that surrounds efforts to win support for new funds.
The latest funding proposal has become embroiled in partisan domestic politics, with congressional Republicans insisting they will only support Ukraine aid if it is tied to sweeping immigration reform.
While Mr Biden and his Democrats are willing to spend more money on border security, they view the changes being demanded by Republicans as unacceptable.
Time is running out before the Christmas congressional break, leading to grim warnings from the White House and Kyiv about the prospect of the war effort without US support.
"I will not walk away from Ukraine," Mr Biden said in a joint news conference with Mr Zelensky on Tuesday evening.
"Ukraine will emerge from this war proud, free and firmly rooted in the West - unless we walk away."
Russian leader Vladimir Putin has been defied at every turn, he added, but was now banking on the US not coming through with more aid.
Mr Zelensky said it was "very important that by the end of this year we can send a very strong signal" to "the aggressor".
"Thanks to Ukraine's defence, other European nations are safe from the Russian aggression," he said.
Earlier in the day, the Ukrainian leader was flanked by Senate Majority Leader Chuck Schumer and his Republican counterpart Mitch McConnell as they entered closed-door talks with senators.
He then met one-on-one with Mike Johnson, the Republican Speaker of the House of Representatives, who has maintained his stance on pushing for border issues.
Speaking to reporters after their meeting, Mr Johnson gave no indication of being open to negotiate, even as he acknowledged further aid to Ukraine is important.
"The border is an absolute catastrophe," he said, warning that House Republicans won't budge until "transformative" changes are made.
"These are the conditions of the American people," Mr Johnson added. "We are resolute on that".
The Speaker blamed the White House for the hold-up, saying it has "no clear strategy to win" and cannot provide the "answers that the American people are owed".
Since Russia invaded Ukraine in February 2022, the US Congress has approved more than $110bn in military and economic aid to Ukraine. Much of that money has already been distributed.
The US has not just been critical to supporting Ukraine's war effort; it's also been largely responsible for coordinating that support. Experts have warned Europe cannot backfill what the US is providing.
Mr Zelensky and Mr Biden said that, without US military support, there is a real danger Ukraine could end up losing the war - not immediately but in the longer term.