After months of stalling, the US House of Representatives approved a $61-billion aid package for Ukraine on Saturday with bipartisan support.
The necessary approval of the upper chamber, the Senate, is still pending but is considered certain.
The bill was passed in the House of Representatives, in which the Republicans have a wafer-thin majority, by a vote of 311 to 112.
There was applause in the chamber after the vote. A number of lawmakers waved Ukrainian flags and shouted "Ukraine, Ukraine." They were called to order.
Numerous Republicans voted against the aid package but were unable to prevent its approval with the help of US President Joe Biden's Democrats.
The vote could cost the Republican Speaker of the House of Representatives, Mike Johnson, his job. Several radical lawmakers who are loyal to former president Donald Trump opposed the Ukraine aid package.
Ukrainian President Volodymyr Zelensky has been pleading for more air-defence support and ammunition from Western partners as the Russians have been pushing hard at the front lines and hitting more infrastructure, including power plants.
At a meeting of the NATO-Ukraine Council that took place on Friday at the request of Kiev, the alliance's Secretary General Jens Stoltenberg announced more support would be forthcoming.