Taliban cuts off vital water supply to Iran
During a 2001 drought, Taliban authorities cut off the flow of the Helmand River between Afghanistan and Sistan-Baluchestan, Iran, which relies on the Helmand as its only source of irrigation. The Iranian government allegedly responds by entering Afghanistan and building a series of diversion canals to restore flows. A 1973 water agreement between the two countries is never ratified and both Iran and Afghanistan have reported violations.