Russian troops support rebel offensive in Ukraine, NATO says

U.S. Secretary of State John Kerry speaks during a press conference at the Foreign and Commonwealth Office in London January 22, 2015. REUTERS/Stefan Wermuth

BRUSSELS (Reuters) - NATO said on Saturday that Russian troops were supporting a rebel offensive in eastern Ukraine with sophisticated missiles, rockets and drones and demanded Moscow halt its support.

Pro-Russian rebels launched an offensive against the strategic port of Mariupol in eastern Ukraine and officials there said rebel rockets had killed at least 30 people.