Subsequent to Israel’s signing of the September 1975 Egyptian-Israeli Disengagement Agreement, Israel receives assurances from the United States about future weapons acquisitions, financial assistance, oil supplies, and the prospects of Israel retaining the Golan Heights. With regard to the conduct of future negotiations, Israel receives an iron-clad promise that Washington would neither recognize nor negotiate with the PLO until it recognizes Israel’s existence, refutes terrorism, and accepts UNSC 242 and 338. This promise impedes official American negotiations with the PLO for the subsequent decade; only in 1988 when the PLO accepts the three premises, does the US open a dialogue with the PLO. (source)