Ukrainian Security Service (SBU) chief Valentyn Nalyvaichenko will visit the United States next week to speak at hearings at the House of Representatives' Committee on Foreign Affairs and the Senate's Committee on Foreign Relations, Markiyan Lubkivsky, an adviser to the SBU chief, said on Facebook.

"The U.S. Congress, particularly the House of Representatives' Committee on Foreign Affairs and the Senate's Committee on Foreign Relations, will hold hearings on Russian military presence in Ukraine on June 16-17 this year. The organizers planned to invite Ukrainian Security Service Chairman Valentyn Nalyvaichenko to present evidence of the Russian Federation's armed aggression against Ukraine," Lubkivsky said.

Nalyvaichenko should also discuss "efficient ways of assistance for Ukraine in the security area" with U.S. partners, he said