KYIV, Ukraine — Russian and Ukrainian officials are making contradictory claims of battlefield successes in their 4-year-old war, with Ukraine saying it has pushed Moscow’s forces back in some places on the front line but the Kremlin insisting that Russia’s invasion of its neighbor is making progress. At the same time, Russia’s almost daily aerial attacks on civilian areas of Ukraine continue. Three powerful glide bombs struck the center of the eastern Ukrainian city of Sloviansk, killing four