Global concern is spiking as evidence emerges that Syria has loaded sarin gas materials into chemical warheads. Once prepared and loaded the weapons have 60 days before they expire, raising fears that the Bashar al-Assad regime intends to use them imminently against rebel forces seeking its overthrow. The Syrian war, a proxy conflict pitting Sunni-backed opposition forces against the Iran-backed regime against Kurdish groups, has already claimed upwards of 40,000 lives. The U.S. and Israel are coordinating closely as Syrian instability deepens.