At the end of this causal chain, Iran, shorn of key allies and already reeling from economic sanctions over its nuclear program, would be thrown back on its heels. The mullahs are already shaky enough to be making near-suicidal threats of blocking the Strait of Hormuz. The population they put down in the 2009 Green Revolution is still seething. The regime is particularly reviled by the young. And its increasing attempts to shore up Assad financially and militarily have only compounded anti-Iranian feeling in the region.
It’s not just the Sunni Arabs lining up against Assad. Turkey, after a recent flirtation with a Syrian-Iranian-Turkish entente, has turned firmly against Assad, seeing an opportunity to extend its influence, as in Ottoman days, as protector and master of the Sunni Arabs. The alignment of forces suggests a unique opportunity for the West to help finish the job.
How? First, a total boycott of Syria, beyond just oil and including a full arms embargo. Second, a flood of aid to the resistance (through Turkey, which harbors both rebel militias and the political opposition, or directly and clandestinely into Syria). Third, a Security Council resolution calling for the removal of the Assad regime. Russia, Assad’s last major outside ally, should be forced to either accede or incur the wrath of the Arab states with a veto.
Force the issue. Draw bright lines. Make clear American solidarity with the Arab League against a hegemonic Iran and its tottering Syrian client. In diplomacy, one often has to choose between human rights and strategic advantage. This is a rare case where we can advance both — so long as we do not compromise with Russia or relent until Assad falls.