Ukrainian President Volodymyr Zelenskiy says nothing will weaken his country's fight against Russia, a day after the US Congress passed a stopgap funding bill that omitted aid to Ukraine.
Defence Minister Rustem Umerov said separately he had received reassurances about further military assistance in a telephone call with US Defense Secretary Lloyd Austin.
"Secretary Austin assured me," he wrote in a post on X, the platform formerly known as Twitter, using flags in place of country names, that US support to Ukraine "will continue" and that Ukrainian "warriors will continue to have a strong back-up on the battlefield."
A Ukrainian foreign ministry spokesperson said Kyiv was working with its American partners to ensure a new budget decision would include funds for the country, and that US support was intact.
Zelenskiy, in a recorded speech marking the Defenders Day holiday on Sunday, did not address the vote in Congress directly, but reiterated his determination to fight to victory.
No one could "shut down" Ukraine's stability, endurance, strength and courage, he said, echoing a Ukrainian verb often used to refer to power outages caused by Russian attacks.
He added that Ukraine would only stop resisting and fighting on the day of victory. "As we draw closer to it every day, we say, 'We will fight for as long as it takes.'"
US President Joe Biden said on Sunday that Republicans had pledged to provide Ukraine aid through a separate vote and US support could not be interrupted "under any circumstances".
Foreign Ministry spokesperson Oleg Nikolenko also sought to reassure Ukrainians about future US support in comments on Facebook, stressing that previously approved funds would be unaffected.
"Support for Ukraine remains unwaveringly strong in the US administration, in both parties and chambers of the US Congress, and most importantly, among the American people," he wrote.
In fighting, Russia says its air defences have shot down six Ukrainian drones over Russian regions and two over Crimea.
Air defences shot down a Ukrainian drone in the southern Krasnodar region about7am lon Sunday ocal time, Russia's defence ministry said.
