US Vice President JD Vance said the war in Ukraine is “not going to end any time soon,” just hours after Washington and Kyiv signed a key minerals agreement that has peace in Ukraine among its goals.

KYIV, Ukraine (AP) — Clinching a deal to end the Russia-Ukraine war “is far too complex to be done quickly,” a senior Kremlin official said Wednesday, as the U.S. labors to bring momentum to peace efforts and expresses frustration over the slow progress.

The joint economic investment between the U.S. and Ukraine comes after China restricted exports of some rare earth minerals to the U.S.