TOPSHOTS US servicemen take part in a military drill in Yavoriv polygon, Lviv district, western Ukraine, on July 24, 2015. Ukrainian and US troops launched fresh drills on July 20 near the war-torn country's Polish border in a bid to show unity and resolve in the face of an increasingly resurgent Kremlin. The annual Rapid Trident exercises involve 1,800 soldiers from 18 countries and last for just under two weeks. AFP PHOTO / YURIY DYACHYSHYN