Iran’s foreign minister has raised the specter of “all out war” that Saudi Arabia would have to fight “to the last American soldier” in case of United States or Saudi strikes.

The recent series of unmanned combat aerial vehicle (UCAV) and cruise missile strikes on Saudi Arabia may well signal yet another “revolution” as a result of advances in military technology, tactics, and war fighting.

American investigators are examining missile circuit boards recovered after strikes against Saudi oil facilities to determine the trajectory of the attack — and whether it originated from Iran — as the Trump administration debates how, and whether, to retaliate.

Pentagon officials on Monday recommended a restrained response to the recent attacks on Saudi oil facilities, arguing against a potentially costly conflict with Iran, which the administration has blamed for the strike on a key American ally, according to officials familiar with Defense Department deliberations.

The strikes on Saudi Arabian petroleum facilities have already shown the new level of risk that the wars in the Gulf region pose to global energy supplies and to the global economy. They have already created at least a minor crisis in world petroleum exports, and repairing Saudi facilities and resuming exports have already become key issues.