By Rupam Jain and Jibran Ahmad KABUL/PESHAWAR, Pakistan (Reuters) – Pakistani Taliban leader Mullah Fazlullah has been killed in a U.S.-Afghan air strike in Afghanistan, a senior Afghan Defence Ministry official said on Friday, a killing likely to ease tension between the United States and Pakistan. An official at the NATO-led Resolute Support mission in Afghanistan confirmed Fazlullah was killed on Thursday. The U.S. military said earlier in Washington it had carried out a strike aimed at a senior militant figure in the eastern Afghan province of Kunar, which is on the Pakistani border, and one U.S. official said the target was believed to have been Fazlullah.