Editor's Note: This story was first published on TheConversation.com in May 2018. It does not discuss the most recent development in the region, but is still a great guide to the state of tensions between the two countries.
After Donald Trump announced that the US would unilaterally pull back from the historic 2015 Iranian nuclear deal, Iranian forces in Syria fired rockets into the Israeli-occupied Golan Heights for the first time. The Israelis retaliated by targeting Iranian forces and positions in Syria. That attack, which killed 23 people, was the biggest Israeli assault on Iranian positions in Syria since the civil war there started in 2011.
For a moment, it looked like two of the Middle East's major political and military players to the verge of a full-scale military conflict. An Israeli-Iranian war could throw the Middle East into one of its most destructive clashes in modern history, one that could polarise the world's powers, dragging in the US, a reliable ally of Israel, and Russia, Syria's strongest ally and hence Iran's strategic ally. And yet, neither has so far chosen to escalate further. Why?