US National Guard servicemen of the 278th armored cavalry regiment take part in a ceremony being replaced by the 2nd brigade tactical group "Strike" of the 101st airborne division of the US army at the International center for peacekeeping and security of the National Academy of land forces named after Hetman Peter Sagaidachny, outside the town of Yavoriv, Ukraine. The purpose of US servicemen is to prepare units of the armed forces of Ukraine in accordance with NATO standards and principles.