Common Questions

What is the S-300 missile system and who has it?: The S-300 is a Russian long-range surface-to-air missile system. Iran received the S-300PMU-2 variant in 2016. Other operators include Russia, China, Syria, Belarus, and several NATO members who inherited Soviet stocks.
How did Israel defeat Iran's S-300 air defences in 2026?: Israeli forces used AARGM-ER anti-radiation missiles and drone swarms to saturate and destroy S-300 radar components before manned strike aircraft attacked targets; several batteries were reportedly disabled in the opening days.
Why did Russia supply S-300 to Iran?: Russia lifted a self-imposed arms embargo after the 2015 JCPOA reduced international pressure on Iran; Moscow argued S-300 is a defensive weapon and used the sale to restore commercial and strategic ties with Tehran.
Can the S-300 stop cruise missiles?: The S-300 is less effective against low-flying Cruise Missiles than against Ballistic Missiles or aircraft; it was not designed for close-in defence against sea-skimming or terrain-following Cruise Missiles.

Background

The S-300 is a family of long-range surface-to-air missile systems developed by the Soviet Union and manufactured by Almaz-Antey in Russia. Iran's variant — the S-300PMU-2 — was delivered in 2016 after Russia lifted a self-imposed arms embargo following the 2015 JCPOA nuclear deal. Iran operates the system to protect strategic sites including nuclear facilities at Fordow and Natanz and the Isfahan enrichment complex.

In the context of the 2026 conflict, the S-300's limitations became tactically significant: the system is designed to intercept high-altitude aircraft and Ballistic Missiles but is less effective against low-observable Cruise Missiles, saturation attacks, and electronic warfare. Israeli and US strikes early in the conflict degraded several S-300 batteries using a combination of AARGM-ER anti-radiation missiles and decoy drones. Russia has not offered replacement systems or spare parts under wartime conditions, citing its own consumption in Ukraine.

The S-300 family also equips several NATO and EU member states, creating interoperability and intelligence-sharing sensitivities that shaped Western decisions about which munitions to share with Israel. Russian exports of the system to Syria, Belarus, and Algeria have made the S-300's operational record closely studied by NATO planners.

Source Material

S-300 Missile System

How the World Sees Them

Iran

Considered S-300 its primary strategic air-defence layer; loss of batteries to strikes has exposed nuclear sites to continued air attack.

Israel

Has invested heavily in defeating S-300 using AARGM-ER anti-radiation missiles and drone-saturation tactics; 2026 strikes degraded Iranian batteries early.

Russia

Exports S-300 as a prestige strategic-deterrence product; its failure in Iranian service creates uncomfortable marketing questions for future buyers.