Why does Iran support Syria?

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Distilled to its essence, Tehran’s steadfast support for Assad is not driven by the geopolitical or financial interests of the Iranian nation, nor the religious convictions of the Islamic Republic, but by a visceral and seemingly inextinguishable hatred for the state of Israel. As senior Iranian officials like Ali Akbar Velayati, a close adviser to Supreme Leader Ayatollah Ali Khamenei, have commonly said, “The chain of Resistance against Israel by Iran, Syria, Hezbollah, the new Iraqi government and Hamas passes through the Syrian highway. … Syria is the golden ring of the chain of resistance against Israel.” So long as the 78-year-old Khamenei remains in power, this hatred will justify Tehran’s continued commitment of blood and treasure to support Assad’s use of all means necessary—including chemical weapons—to preserve his rule.