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.

Ukraine and the U.S. could sign online a memorandum of intent on Thursday on the minerals deal currently being negotiated by the two countries, President Volodymyr Zelenskiy said. President Donald Trump has pushed for a deal that would allow the United States to have privileged access to Ukraine's natural resources and critical minerals in what he casts as repayment for military aid provided by Washington to Ukraine under the previous presidency of Joe Biden.