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By Vali R. Nasr
Dr. Nasr is a scholar of Iranian politics and U.S. policy in the Middle East.
The United States’ attack on Iran’s nuclear sites last weekend, following a weeklong Israeli bombing campaign, has marked a turning point for Iran. Washington’s involvement in the conflict represents one of the biggest challenges to the Islamic Republic since its founding in 1979 and is a moment of truth for the country’s supreme leader, Ayatollah Ali Khamenei, who has maintained Iran’s hostility to the West during his 36 years in power.
Now the future of the country’s nuclear program, and the fate of the tenuous cease-fire with Israel, rests in his hands — and even in the face of grave threat, he is unlikely to back down.







