(CNN) The price of oil fell by 2.2% just minutes after news spread that US National Security Advisor John Bolton was out of a job. In an instant, the prospect of a catastrophic war in the Middle East seemed to recede dramatically.

Bolton is famously the man who never met a war he didn't like (except Vietnam, which he avoided). And conflict with Iran was the war he seemed to like most.

In 2015, he penned an editorial in the New York Times entitled "To Stop Iran's Bomb, Bomb Iran." He was a regular (paid) speaker at the annual meetings of Mujahedin-e-Khalq (MEK), an Iranian exile group which for years was hosted by Saddam Hussain, and which until 2012 was on the US State Department's terrorist list

At his most recent appearance at a MEK meeting, in 2018, Bolton declared: "The behavior and the objectives of the [Iranian] regime are not going to change and, therefore, the only solution is to change the regime itself."

He has previously advocated for regime change in Venezuela, Iraq, North Korea, Libya and Syria, to name a few.

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