Let’s imagine a timeline in which the United Arab Republic never broke apart and instead grew closer together and created a competent military trained by the Soviets and armed with the best equipment the Soviets would provide them with. Iraq also joined the UAR. Sometime in the 1960s or 1970s it has a war with Israel, and is so successful that it becomes clear that Israel would be wiped off the map unless without direct intervention in their favor. (ITTL the Israeli nuclear weapons program is severely delayed.) For some reason America can’t intervene - maybe they are too busy with the Vietnam war or they fear an oil embargo. Would Turkey or Iran be willing to intervene? If Iran intervenes, could the backlash against the intervention start an early revolution? If Turkey intervenes, how is the Cyprus conflict changed?
Scenario 1: Israel starts the war like in 1967
Scenario 2: The UAR attacks Israel on Yom Kippur or another Jewish holiday.