https://www.jewishpolicycenter.org/insight/
For decades, the concept of a “Shiite Crescent” anchored by the radical Shiite supremacists in Iran and passing through Iraq, Syria, and Hezb’allah to the Mediterranean Sea has been understood. It would provide Iran not only with closer access to Israel, but also spread across the northern borders of two key Sunni adversaries — pro-American Jordan, and its most important enemy, Saudi Arabia, guardian of Mecca and Medina. It would further split off Sunni Turkey (a historic foe) from the other Sunni Middle East states.
The Crescent is, for Iran, a single battlefront and the Islamic Republic has spent decades successfully undermining and wrecking each subsidiary member.
Iraq is hardly a functional country. But as a staging ground for Iranian militias and weapons depots headed west, Iraq is a prize. Syria is largely a dead zone. But as a launching pad for Iranian military bases and attacks on Israel, Syria is a bonanza. Lebanon is a corrupt satrap of Syria and Iran, governed by a terror organization with a foreign legion and an international money/drug/weapons racket. But its very weakness and its border with Israel make Lebanon invaluable.
Each member of this “gang of four” maintains a state of war with Israel and threatens it on a regular basis. Israel’s attacks on weapons centers Lebanon, Syria and Iraq are not an escalation of a fragile situation — they are a defensive response to a high-tech military buildup orchestrated by Iran across the region.
Israel has the support of the United States for its defensive actions. But until now, U.S. foreign and defense policy have actually made things worse for Israel and others in the region by empowering Iran – and even now, when the administration is aware of its malign nature, and has reimposed economic sanctions on Tehran, it needs a strategy against Iranian gains on the ground.