President Joe Biden has vowed continued US support for Ukraine, after further military funding was excluded from a last-minute congressional budget deal.
The temporary measure, pushed through to avert a government shutdown, did not include $6bn (£4.92bn) in military aid for Kyiv – a top White House priority.
Hardline Republicans oppose further military aid, with many openly opposing Mr Biden’s approach to the war.
But on Sunday Mr Biden said Ukraine could “count on” US support.
“We cannot, under any circumstances, allow US support to Ukraine to be interrupted,” Mr Biden said.