The United States expects to sign an agreement with Ukraine on access to critical minerals and natural resources "very shortly," U.S. President Donald Trump said on March 20. The two nations had previously planned to sign a minerals deal on Feb.

According to IEEE Spectrum, Ukraine doesn’t have any mineable rare earths. The publication quotes Erik Jonsson, senior geologist with the Geological Survey of Sweden, who says there are four areas with substantial deposits of rare earth ores, and four slightly bigger deposits: Yastrubetske, Novopoltavske, Azovske and Mazurivske.

Officials in Kyiv say the country cannot possibly accept the proposal and that new negotiations would be needed. But they have not rejected it outright, which would anger the White House.