On February 14, 1979, Dubs was kidnapped by armed militants posing as police. The kidnappers demanded the release of the imprisoned leader of their party. Hafizullah Amin’s government refused to negotiate with the militants. Dubs was then assassinated. A successor to Dubs was not named and the Soviet Union invaded Afghanistan in December 1979. The U.S. embassy was finally closed in 1989 as security deteriorated.