The accord, signed in Washington after months of complex negotiations, was strongly backed by US President Donald Trump, who has pushed for a tangible return on US aid to Kyiv.
The agreement is central to efforts by Kyiv to rebuild relations with Trump’s administration, which had grown tense since his return to office in January.
Ukrainian officials said the deal could help secure continued American support in the country’s war with Russia.
US Treasury Secretary Scott Bessent and Ukrainian First Deputy Prime Minister Yulia Svyrydenko signed the deal in a ceremony in Washington.
“The agreement clearly signals the Trump Administration’s commitment to a free, sovereign, prosperous Ukraine,” the US Treasury wrote on X, formerly Twitter.
Svyrydenko said the United States will contribute financially to the new joint fund and may offer further aid, such as air defence systems, though Washington did not confirm that element in its own statements.
The US remains Ukraine’s largest military donor since Russia’s 2022 invasion, providing over $72 billion in aid, according to data from the Kiel Institute.
Before the signing, Trump reiterated that US support should come with returns, citing Ukraine’s rare earth mineral deposits as a strategic benefit to American interests.
In its announcement, the Treasury said the partnership acknowledges “the significant financial and material support that the people of the United States have provided to the defence of Ukraine since Russia’s full-scale invasion.”