Trump’s meeting with Zelensky comes as Washington and Kyiv hammer out a mineral deal, with war aid on the line. But the value of Ukraine’s minerals is murky.

Ukraine has agreed to the terms of a deal that would allow the U.S. access to the country's rare earth and critical minerals reserves.

Ukraine might have turned the tide in its rocky relations with the U.S. by offering President Donald Trump's administration access to its critical minerals as part of wider peace negotiations, but experts warn that question marks remain around the value and accessibility of such deposits.