Four months before a swarm of drones and missiles crippled the world’s biggest oil processing facility in Saudi Arabia, Iranian security officials gathered at a heavily fortified compound in Tehran.

The group included the top echelons of the Islamic Revolutionary Guard Corps, an elite branch of the Iranian military whose portfolio includes missile development and covert operations.

The main topic that day in May: How to punish the United States for pulling out of a landmark nuclear treaty and re-imposing economic sanctions on Iran, moves that have hit the Islamic Republic hard.

With Major General Hossein Salami, leader of the Revolutionary Guards, looking on, a senior commander took the floor.

“It is time to take out our swords and teach them a lesson,” the commander said, according to four people familiar with the meeting.

Hard-liners in the meeting talked of attacking high-value targets, including American military bases.

Yet, what ultimately emerged was a plan that stopped short of direct confrontation that could trigger a devastating U.S. response. Iran opted instead to target oil installations of America’s ally, Saudi Arabia, a proposal discussed by top Iranian military officials in that May meeting and at least four that followed.

This account, described to Reuters by three officials familiar with the meetings and a fourth close to Iran’s decision making, is the first to describe the role of Iran’s leaders in plotting the Sept. 14 attack on Saudi Aramco, Saudi Arabia’s state-controlled oil company.

These people said Iran’s Supreme Leader Ayatollah Ali Khamenei approved the operation, but with strict conditions: Iranian forces must avoid hitting any civilians or Americans.

Reuters was unable to confirm their version of events with Iran’s leadership. A Revolutionary Guards spokesman declined to comment. Tehran has steadfastly denied involvement. Read more

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