The U.S. and Russia are expected to release a joint statement Tuesday morning after discussions in Saudi Arabia aimed at achieving a Black Sea maritime ceasefire deal, sources familiar with the matter told CBS News.

The statement is scheduled to be out at 4 a.m. in Washington, D.C., and 11 a.m. in Moscow, two of the sources said. While the details of the statement were not immediately clear, reports shared with the Trump administration from the U.S. technical team in Riyadh seemed optimistic, the sources said.

Ukrainian officials have also been briefed, one of the sources said.

A Russian negotiator told the state TASS news agency Tuesday that Moscow would continue "useful" talks with the U.S. over the Ukraine conflict and would seek to involve the U.N. and other nations, according to the French news agency AFP. Grigory Karasin was quoted as saying, "We talked about everything, it was an intense dialogue, not easy, but very useful for us and the Americans, lots of problems were discussed during 12 hours of negotiations".