THE HAGUE (Reuters) - A framework agreement outlining U.S. access to revenues from Ukraine's natural resources in exchange for security guarantees has legal gaps that must be filled in future negotiations, four experts told Reuters a day before the countries' leaders meet in Washington.

President Trump, who had insisted he wanted “payback” for past military aid to Kyiv, suggested President Volodymyr Zelensky would visit Washington this week to sign an agreement, which he called a “very big deal.

A critical minerals deal Donald Trump has negotiated with Ukraine could ease tensions between Kyiv and the U.S. president and at the same time win back support from his Republicans in Congress for a new round of aid to the war-torn country.