By Ron Bousso, Jonathan Saul and David Sheppard LONDON (Reuters) - At least 3 million barrels of Iraqi Kurdish oil are on ships heading to Asia, with trade sources naming China as a possible destination as the auto**mous region expands efforts to establish independent oil sales in defiance of Baghdad. Two sources with k**wledge of the matter said Iraqi Kurdistan was in talks to potentially supply China with 4 million barrels of oil. ...