Washington is by far Kyiv's biggest donor of security aid, committing $43.9 billion since Russian forces invaded in February 2022.

But opposition from hardline Republican lawmakers has put future assistance for Kyiv in doubt, and the US government is now relying on previously approved aid in the absence of new funding from Congress.

The latest package "utilizes assistance previously authorized for Ukraine during prior fiscal years," the Pentagon said in a statement.

"The Biden administration calls on Congress to meet its commitment to the people of Ukraine by passing additional funding to ensure Ukraine continues to have what it needs to defend itself against Russia's brutal war of choice," the statement said.

The package also includes air defence missiles, night vision devices, demolitions munitions and cold weather gear.

Ukrainian President Volodymyr Zelensky thanked the US for the military assistance in a post on social media.

"As winter approaches, strengthening air defense is critical to protect Ukrainian cities and infrastructure," Zelensky said on X, formerly known as Twitter.

"I appreciate our agreements with President (Joe) Biden being implemented," he added.

US officials have spearheaded the push for international support for Ukraine, quickly forging a coalition to back Kyiv after Russia invaded and coordinating aid from dozens of countries.

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