Current U.S. sanctions on Iran are unlikely to stop Iranian oil exports completely, a long-time adviser at Saudi Arabia’s Energy Ministry said on Tuesday, adding Iran would be unable to close the straits of Hormuz and Bab al-Mandab even partially. The adviser said Iran would be the first to lose out on a move to block those major shipping routes and that any such action would trigger further sanctions on Iran. Iran has said if it cannot sell its oil due to U.S.