The United States and Ukraine are trying to hammer out a natural resources agreement that would give Washington access to Kyiv’s untapped mineral riches in exchange for investments and what Ukraine hopes would be concrete security guarantees.

Volodymyr Zelenskiy is heading to Washington Friday to sign a deal that will allow the US to tap into future revenue from the war-battered country’s natural resources.

A copy of the agreement obtained by The New York Times says that the United States “supports Ukraine’s effort to obtain security guarantees needed to establish lasting peace.”