LVIV, Ukraine (Reuters) -Ukraine said Belarus could be planning to invade its territory on Friday and accused Russia of trying to drag its ally into the war by staging air attacks on Belarus from Ukrainian air space. Belarus has served as a staging post for Russian troops, missiles and aircraft, both before and after Russia launched its invasion of Ukraine on Feb. 24, but it has not deployed its own forces in active battle. Ukraine’s military accused Russian aircraft of firing at Belarusian border villages from Ukrainian air space on Friday to provide an excuse for an offensive. “This is a PRO…