U.S. National Security Adviser John Bolton says Iran was behind the attack on four oil tankers at a port in the United Arab Emirates this month.br Bolton told reporters in Abu Dhabi on Wednesday that there had been a previously unknown attempt of drone strikes and attack the Saudi oil port of Yanbu by Iran.br Tehran dismissed the accusation, calling Bolton's latest remarks as a "ludicrous claim".br Bolton is a longtime hawk who has previously advocated for regime change in Iran, but Trump said that he's not looking for regime change but for no nuclear weapons.