The Islamic Republic of Iran deploying the S-300PMU2 batteries around nuclear facilities in Fordow. Fordow, near the city of Qom, is the site of an underground uranium enrichment facility at a former Islamic Revolutionary Guard Corps base.
Iran intends to harden these facilities against probable air attack by the United States or Israel. The S-300PMU2 long range, Surface-to-Air Missile (SAM) system are deployed to protect Iranian state and military facilities from air attacks.
The S-300 SAMs currently being delivered are an upgraded version of the weapons systems initially ordered by Iran in 2010. In July 2015, Russian Presidential Aide Vladimir Kozhin announced that Russia would update the S-300 SAMs to meet specific Iranian needs without, however, offering technical details.
Russia was forced to cancel the delivery of the weapons in June 2010 due to a United Nations Security Council resolution imposing sanctions — which included a ban on the sale of hi-tech weapons. After the cancellation of the arms deal, Iran demanded $4 billion in compensation from the Russian state.
— Iran (@Iran) 28 августа 2016 г.