By Tom Balmforth, Polina Nikolskaya and Steve Holland MOSCOW/DONETSK/WASHINGTON (Reuters) -Western nations and Japan on Tuesday punished Russia with new sanctions for ordering troops into separatist regions of eastern Ukraine and threatened to go further if Moscow launched an all-out invasion of its neighbour. The United States, the European Union, Britain, Australia, Canada and Japan announced plans to target banks and elites while Germany halted a major gas pipeline project from Russia in one of the worst security crises in Europe in decades. Bitter about Ukraine’s long-term goal to join NAT…