The US administration will "quickly provide" arms to meet Ukraine's urgent military needs, President Joe Biden assured Ukrainian President Volodymyr Zelensky in a phone call on Monday.
The new $61 billion security package, which includes air defence weapons, will start being distributed once the US Senate passes the legislation and Biden has signed it into law.
After months of delay, the House of Representatives gave its approval at the weekend. The Senate is expected to vote on the package on Tuesday.
Biden stressed that the US would provide economic assistance to maintain financial stability in Ukraine and help it build back critical infrastructure following Russian attacks.
The US would also support reform "as Ukraine moves forward on the path of Euro-Atlantic integration," the US president said, according to a White House statement.
Biden pledged "lasting commitment to supporting Ukraine as it defends its freedom against Russian aggression."
"I appreciate President Biden's unwavering support for Ukraine and true global leadership," Zelensky posted on social media after the conversation.
"The president has assured me that the package will be approved quickly and that it will be powerful, strengthening our air defense as well as long-range and artillery capabilities."
