By Pavel Polityuk and Natalia Zinets LVIV, Ukraine (Reuters) -President Volodymyr Zelenskiy said on Friday Ukraine was at a “strategic turning point” in the war as Russian forces bombarded cities across the country and appeared to be regrouping for a possible assault on Kyiv, with satellite images showing them firing artillery as they closed in on the capital. The governor of the Kharkiv region, on the Russian border, said a psychiatric hospital had been hit, and the mayor of the city of Kharkiv said about 50 schools there had been destroyed. In the besieged southern city of Mariupol, the city…