"The punitive and retaliatory move has conveyed a clear message to Takfiri terrorists and their regional and trans-regional sponsors" that such evil acts will be retaliated, the IRGC stated.
The Russians, who have been providing air cover for Assad's forces since 2015, appear to want to avoid further USA targeting of Syrian warplanes or ground troops that have come under US attack in eastern Syria recently.
"The coalition's mission is to defeat ISIS in Iraq and Syria", a statement from the USA -led coalition fighting ISIS in Syria said.
The Iranian military on Sunday said it had launched a number of missiles into eastern Syria in retaliation to the June 7 attacks in Tehran (pictured above).
"Regional and worldwide allies of the terrorists must understand this missile operation is a warning message".
"We are carrying out operations from inside Iranian territories, like America and Russian Federation, which, as military powers, occupy a special position", Alaeddin Boroujerdi, an Iranian MP who heads the parliament's National Security and Foreign Policy Committee, said in an interview with state TV.More news: Cousin says woman shot by police wasn't violent
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"The first message is that Iran punishes terrorists", he said.
A photograph released by Iran's defense ministry purportedly shows a Zolfaqar being launched.
According to the IRGC, the missiles fired on Sunday included the Zolfaqar, a new surface-to-surface missile which Iran has claimed can destroy targets around 450 miles away "with a zero margin of error".
"And, of course, we need to see this in the wider geopolitical context: it will be very interesting what the reaction is going to be from countries such as Saudi Arabia, the United States and Israel, because Iran is saying it can retaliate and it will".
The two regional heavyweights back opposing sides in several conflicts including in Syria and Yemen. Gen. Ahmad Reza Pourdastan called the strike a "crushing response and a warning" to those seeking to ignite tensions in the region, with their troublemaking and ignorant ambitions.
It was not known what exactly was hit and Iran has provided no details.
Saudi Arabia struck a giant arms deal with Washington this month during President Donald Trump's visit to the region, which saw him clearly align his administration with Riyadh and lash out against Tehran.
Iran has called in the Swiss charge d'affaires, who looks after U.S. interests, to protest against comments by Secretary of State Rex Tillerson backing "peaceful transition" in the Islamic republic.