Ukraine said Thursday that it had signed the basis of a minerals deal with the U.S., although the details of the agreement are yet to be announced.

The signed memorandum of understanding was thin on details, and the White House did not comment. But President Trump has said he expects to sign a minerals deal with Kyiv soon.

Ukraine and the United States on Thursday signed a memorandum as an initial step towards the clinching of an agreement on developing minerals in Ukraine, Yulia Svyrydenko, Ukraine's first deputy prime minister and economy minister,