President Joe Biden has vowed continued US support for Ukraine, after further military funding was excluded from a last-minute congressional budget deal.
Senior Senate leaders from both parties released a joint statement signalling their intention to "ensure the US government continues to provide" support to Ukraine in the coming weeks.
But the move - which came just nine days after President Volodymyr Zelensky flew to Washington to plead for further support - reflects increasing opposition from hard-right Republicans in the House of Representatives to the war in recent months.
Ukraine's foreign ministry says the "flow of US aid won't change" with $3bn of humanitarian and military support set to still arrive, but it concedes "ongoing programmes" might be affected.
The growing scepticism from some Republicans and the recent election victory for a populist, pro-Moscow party in Slovakia are concerning for both Ukraine and the European Union.
In an interview with the BBC in Kyiv, the EU's most senior diplomat, Josep Borrell, said he was "worried" by the latest decision on funding for Ukraine by the US Congress.
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