Ukraine said on Thursday that Kyiv and Washington had signed a memorandum as an initial step towards clinching an agreement on developing mineral resources in Ukraine, a deal promoted by U.S. President Donald Trump.

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 full minerals deal with Kyiv soon.

The move would a step towards a final deal derailed by a row at the White House in February.