یک مُشت حرفهای "خُب. که‌چی؟" گونه!!!

The Soviets were surprised by the revolution, and initially somewhat optimistic. After all, any popular uprising had left wing potential. At least that is what they thought initially. However, they were very quickly dispelled of this notion, as Iran went from an incidentally hostile country, based on it’s far right pro American government, to an overtly and aggressively hostile nation who hated communism and the Soviets in general, for being atheists and enemies of Islam in general. As it turns out Islamic fundamentalism, was not compatible with atheist communism.

In late 1978, Brezhnev congratulated Iran in his public speech:

We welcome the victory of this revolution which put an end to the despotic oppressive regime... We wish new revolutionary Iran success and prosperity, and hope that relations of good neighborliness between the peoples of the Soviet Union and Iran will be fruitfully developed on the firm basis of mutual respect, goodwill and non-interference in each other's internal affairs

Mansoor Akbar, USSR-IRAN RELATIONS (1979-86) Pakistan Horizon

However, Iran almost immediately renounced the 1921 treaty with the USSR, and following the wake of Soviet intervention in Afghanistan, Ayatollah Khomeini said in his 1980 new year address, that Iran is at war with global communism, while the foreign minister Sadegh Ghotbzadeh decided to speak for all of Islam when it said that the Soviets was hostile to all Muslims of the world. Ghotzbzadeh was piously executed by Khomeini along with many other clerics and politics by 1982, so he didn’t last long in his criticism. Iran also went on to blame the secular uprisings in Kurdistan on communism and the USSR in particular.

Iran not feeling bound by its treaties with the USSR, was never the less surprised and outraged, that Iraq didn’t feel bound by its treaties with the Shah now that Iran had become a religious dictatorship. The Iran-Iraq war ensued, Iran had seemingly also forgotten that they did in fact not speak for the entire Muslim world. Iraq had a friendship treaty with the USSR, and as Iran declared itself an enemy of the USSR, the Soviets became very open about sales to Iraq. By 1986 according to SIPRI, the 23% of Soviet arms exports were going to Iraq, compared to 22% shared among all Warsaw Pact members. That was quite something.

In short, Iran’s overt hostility and refusal at rapprochement with the USSR resulted in the USSR supporting Iraq against Iran, and while the Soviets and Iran, never directly fought and even maintained some economic ties, the relationship was very practically mutual disgust.