The Trump administration is still pursuing an agreement with Ukraine over the besieged country’s rare earth minerals, even though the initial negotiations did not get off to a positive start and led to frustration in Washington.

Treasury Secretary Scott Bessent presented the proposal to Ukrainian President Volodymyr Zelensky last week, and many of the details remain unclear, though the framework of the deal calls for U.S. investment in Ukraine’s rare earth mineral projects seeking roughly a $500 billion return to recoup the billions of dollars of U.S. military aid provided to Ukraine throughout its war against Russia.