In 1981, the United States didn't have the best political reputation vis-à-vis Vietnam. So when the US Secretary of State made allegations that the USSR had sprayed both Vietnam and Laos with chemical weapons, the world went crazy. Then the world got confused.
It’s believed that last week the Syrian government murdered hundreds of its own civilians with chemical weapons. We don’t know which weapon they used, but we do know it’s one of a handful of chemicals called nerve agents.