Leaders across the continent are reportedly growing uneasy as diplomatic uncertainty clouds future support for Kiev

Western European leaders are growing concerned that the US may walk away from the Ukraine conflict, Bloomberg has reported.

Officials fear US President Donald Trump could make a deal with Moscow that leaves Kiev's remaining backers managing the conflict without Washington's military or security support, the news outlet has said, citing sources.

On Tuesday, Trump's special envoy Steve Witkoff and his son-in-law Jared Kushner visited Moscow to discuss possible paths toward a settlement with Russian President Vladimir Putin. Putin called the talks "necessary" and "useful" but rejected parts of the US proposal. Trump, however, said the negotiators left Moscow confident that both sides want to end the conflict.

A Western European official cited by Bloomberg described the worst-case scenario as a full US withdrawal, the lifting of pressure on Russia, a ban on the use of US weapons by Ukraine, and an end to intelligence sharing.

A less-damaging option would be the US stepping back from talks but still selling arms to NATO for onward transfer to Ukraine, while intelligence cooperation would be kept in place.

The unease has been compounded by Trump's release of a 33page National Security Strategy, which warned that Europe risked being "wiped away" unless it overhauled its politics and culture.

The document accused Washington's European partners of harboring "unrealistic expectations" regarding the conflict and displaying a "lack of selfconfidence" in dealing with Russia. It also stated that the US remains "open to structured diplomatic channels with Russia" wherever such engagement aligns with broader American interests.

"The risk remains that the US walks away from the whole issue and leaves it up to the Europeans," said John Foreman, former UK defense attache to Moscow and Kiev.

Earlier, Bloomberg reported that Witkoff had advised Russia on how to shape a peace proposal that Trump might find acceptable. In parallel, Macron reportedly warned that the US could "betray" Ukraine, while Merz was said to have accused Washington of "playing games."

The EU is exploring ways to use roughly 260 billion ($280 billion) in frozen Russian central bank assets held at Euroclear, but efforts remain stalled. Belgium has demanded strong safeguards, while Hungary has blocked earlier funding plans.
Washington opposes fully seizing the assets and prefers using only the generated profits, slowing agreement further. Merz argued the funds should stay under EU control and support Europe's own priorities.