By Max Hunder KYIV (Reuters) -At least six people were killed and more than 30 are feared trapped after Russian Uragan rockets hit a five-storey apartment block in Ukraine’s Donetsk region, leading to the building collapsing, the region’s governor said on Sunday. Ukraine also reported clashes with Russian troops on fronts in the east and south, as the United States sought to marshal international support in opposing Moscow’s invasion. Donetsk Governor Pavlo Kyrylenko said the strike on the apartment building took place on Saturday evening in the town of Chasiv Yar. He said six people had been …