After the March 1970 agreement between the Iraqi government and the Kurdish rebels, Talabani returned to Iraqi Kurdistan, and rejoined the KDP, even though he wouldn't hold an office at the time. The Kurdish separatist movement collapsed in March 1975, after Iran ended their support in exchange for a border agreement with Iraq. This agreement was the 1975 Algiers Agreement, where Iraq gave up claims to the Shatt al-Arab (Arvand Rūd) waterway and Khuzestan, which later became the basis for the Iran–Iraq War. Believing it was time to give a new direction to the Kurdish separatists and to the Kurdish society, Talabani, with a group of Kurdish intellectuals and activists, founded the Kurdish Patriotic Union of Kurdistan (Yekiaiti Nishtimani Kurdistan).