By Stephen Farrell LVIV, Ukraine (Reuters) -A leading rights group said on Sunday it had documented “apparent war crimes” committed by Russian military forces against civilians in Ukraine. Human Rights Watch (HRW) issued a statement saying it had found “several cases of Russian military forces committing laws-of-war violations” in Russian-controlled regions such as Chernihiv, Kharkiv and Kyiv. The statement, published in Warsaw, came one day after dead civilians were found lying scattered through the streets of the Ukrainian country town of Bucha near Kyiv, three days after the Russian army pu…