According to Trita Parsi, Iran co-operated with Israel behind the scene during Khomeini era

Yes, Trita Parsi, an expert on Middle Eastern geopolitics, has written extensively on the complex and often surprising relationships between Iran and Israel, particularly during the early years of the Islamic Republic of Iran. In his book Treacherous Alliance: The Secret Dealings of Israel, Iran, and the United States, Parsi explores the covert cooperation between Iran and Israel during the Khomeini era, despite the public hostility between the two nations.

During the 1980s, particularly in the context of the Iran-Iraq War, Iran found itself in need of military supplies and support. Israel, despite being publicly denounced by the Iranian leadership, saw Iran as a counterbalance to Iraq, which was viewed as a greater threat to Israeli security at that time. As a result, there was a pragmatic, though covert, cooperation between the two nations. This included arms deals, facilitated in part by the United States, and other forms of military and intelligence cooperation.

This relationship was paradoxical because, while the Iranian regime publicly condemned Israel and Zionism, it was willing to engage in covert cooperation when it served its strategic interests. Parsi's work highlights the complexity and pragmatism that often characterize international relations, even among nations that appear to be staunch enemies.