(Reuters) – Several rockets hit Lviv in western Ukraine, local officials said, in what appeared to be the first attacks within the city limits since the start of the war. U.S. President Joe Biden, visiting NATO ally Poland, called Vladimir Putin a “butcher”. FIGHTING * The mayor of Lviv said another rocket had hit the city in western Ukraine, not long after two rockets struck its outskirts. * Russian forces have taken control of the town of Slavutych, where workers at the defunct Chernobyl nuclear plant live, the governor of Kyiv region said. * The mayor of the besieged southeastern port of Ma…