By Matt Spetalnick and James Mackenzie HANOI/KABUL (Reuters) - U.S. President Barack Obama confirmed on Monday that the leader of the Afghan Taliban had been killed in an American air strike, an attack likely to trigger another leadership tussle in a militant movement already riven by internal divisions. Obama, on a three-day visit to Vietnam, reiterated support for the government in Kabul and the Afghan security forces, and called on the Taliban to join peace talks. The president authorized the drone strike that killed Mullah Akhtar Mansour in a remote region just on the Pakistani side of the border with Afghanistan on Saturday, and Afghan authorities have said the mission was successful.
