if the USSR had directly invaded the Islamic Republic of Iran

Relations with Iran and the US since Ayatollah Khomeini stepped off of his plane in Tehran in 1979 showed Iran breaking all rules of diplomacy especially after it seized American hostages in the US embassy in Tehran.

Before the seizure of hostages however one man named Mahmoud Ahmadinejad (Iran's current president) opposed the idea stating that it would boost the influence of the Soviets and that the real threat to them was not the Americans but Russia and the Marxists.



Saddam Hussein's Iraq was an alley of the Soviets and when over 70,000 Iraqi troops along with several divisions of tanks crossed the border into the oil fields of southern Iran the Soviets didn't condemn or oppose it and the UN Security Council called for a ceasefire but made no demand for Iraqi forces to withdraw from Iran, yes it failed to condemn a country that invaded another!

Right to the north of Iran was the Soviet border, the Shah's Iran had been America's most powerful ally, for it's strategic location and it's borders, and during the 1970's the Shah was buying up a lot of modern military equipment from the United States such as the 80 ordered (and 79 delivered) F-14A Tomcats which designed and built to defend US aircraft carriers from long distances, along with that ordered were over 300 F-16's but none were delivered, along with that already present were several different SAM networks and some very mobile but highly advanced army units would delay Soviet ground movements towards the south of the country to give the Americans time to defend Iran.



In 1980 that had all changed, the US Navy helicopters failed to reach Tehran to rescue the American hostages in the ill-failed Operation Eagle Claw and the Soviets ally Iraq had begun an invasion, after acquiring information on US estimates that doubted the present Iranian military were probably unable to properly operate it's tanks, SAM networks and fighter jets.

They were in one sense right but the Iranian military quickly rebuilt itself and had sent Iraq on the defensive in 1982 and resulted in a further six years of Iran on the offensive in a bloody war that would cost 1,000,000 lives on both sides!

Apart from that fact both the United States and the Soviet Union supported Iraq, the Soviets keeping open usual business with Saddam's government supplying them mainly with tanks and fighter aircraft as usual, while the US supplied Iraq (remember an ally of the Soviet Union) with thousands of assault rifles, and a handful of UH-1 Huey's for the Iraqi army after 1982 defending their vital oil interests in the Persian Gulf and Saudi Arabia.

However if the Soviet Union had invaded Iran in lets say the mid 1980's it would have been met with little opposition from the UN until they had crushed the Iranian regime and its accompanying military, it would have put them in a position with a massive eastern border to oil rich waters of the Persian Gulf and right in short striking distance of Saudi Arabia and the other smaller countries of the pro Western Emirates.

It would also have opened up the large strategic land that is Iran for use by the Soviet Army and Air Force as a base in their war against the rebels in Afghanistan which would further isolate Pakistan.



However a war with Iran with Iraq as an ally would have forced the Soviet Union into deeper economic turmoil as Khomeini had truly united the country together under religious ties, as proved by the amount of volunteers that fought off and demoralized the invading Iraqi forces.

However it would have been worth it in one sense in the long term considering that it would have given the Soviets a massive platform for military forces to influence and dictate how things work in the Persian Gulf, along with it's ally Iraq very evenly splitting both superpowers control over the oil rich region, and would have enabled the Soviets to close off America's oil shipping through the Strait of Hormuz which could have crippled several western economies, it was here where US Navy warships had to protect their tanker convoys during the 'Tanker War' phase of the Iran Iraq War.



It's an interesting scenario and one which I'm sure was considered by the Soviets and feared by the Americans.