In this Tuesday, August 8, 2000, file photo, Iranian clergyman Mohammad Azadparvar, who allegedly was injured by chemical weapons in the 1980–1988 Iran–Iraq War, rests next to a picture of the supreme leader Ayatollah Ali Khamenei at a demonstration in front of Iranian parliament in support of the supreme leader Ayatollah Ali Khamenei. For more than a generation, Iranian newspapers regularly post notices: Another veteran of the 1980s war with Iraq has died of complications from exposure to chemical weapons from Saddam Hussein’s arsenal. The claims now that Iran’s Syrian allies used similar battlefield tactics, including possibly unleashing sarin gas, forced Tehran’s leaders into perhaps their most difficult juncture of the nearly 30-month Syrian civil war: How much to stick by Bashar Assad if the Western allegations are backed by U.N. inspection teams. (AP photo/Vahid Salemi)