By Pavel Polityuk and Polina Nikolskaya KYIV/DONETSK (Reuters) – Ukraine declared a state of emergency on Wednesday and Moscow said separatists in the east had asked for help to repel “aggression” as the United States stepped up efforts to deter an all-out invasion by imposing fresh sanctions. Shelling has intensified in the east, where Russian President Vladimir Putin has recognised two separatist regions as independent and ordered the deployment of what he called peacekeepers and the West says is the beginning of an invasion. Convoys of military equipment, including nine tanks, moved towards…