Afghanistan–Iran relations were established in 1935 during King Zahir Shah's reign and the Pahlavi dynasty of Persia. They have been negatively affected by the 1979 Iranian Revolution and issues related to the 1978–present Afghan conflicts (i.e. Mujahideen, Afghan refugees, and Taliban), as well as Iran's water dispute, the growing influence of the United States in Afghanistan, and the execution of thousands of Afghan prisoners in Iran.