By Tom Balmforth KYIV (Reuters) – Ukraine accused Russia on Monday of looting empty homes in the southern city of Kherson and occupying them with troops in civilian clothes to prepare for street fighting in what both sides predict will be one of the war’s most important battles. In recent days, Russia has ordered civilians out of Kherson in anticipation of a Ukrainian assault to recapture the city, the only regional capital Moscow has seized since its invasion in February. Kherson, with a prewar population of nearly 300,000, has been left cold and dark after power and water were cut to the sur…