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"It was agreed that several key members of the new U.S. presidential administration would visit Ukraine soon. And very important agreements will be signed, including agreements on defense cooperation, and an agreement on defense procurement and an agreement on military-technical cooperation are among them," the president said at a closing press conference in Washington, D.C., on June 21.

Read alsoPoroshenko: High-ranking U.S. officials to visit Ukraine soonAs UNIAN reported earlier, Poroshenko's press secretary Svyatoslav Tsegolko said that the Ukrainian president had established friendly relations with U.S. Secretary of Defense James Mattis, and the U.S. Department of Defense views developments in Ukraine as important.

"'From a patriot to a patriot. Yours faithfully.' Sincere words of the U.S. Secretary of Defense addressed to our president in the best possible way characterize the friendly relations that have developed after their meeting," Tsegolko wrote on Facebook after the bilateral meeting.