The S-400 Triumf, which NATO calls the SA-21 Growler, is a fourth-generation long-range missile-defense system that Russia began developing in 1993.
8 photos of the S-400 in Syria, Russia's most advanced missile defense system that the US could go up against
The pictures were taken in 2015 at Russia's Hmeimim Air Base in Syria.
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It's the successor to the S-200 and S-300 air-defense systems and became operational in 2007.
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It's capable of taking out aircraft, drones, cruise missiles, and ballistic missiles in the terminal phase.
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However, it does not have hit-to-kill ballistic-missile-defense technology, which means it can't physically collide with incoming warheads.
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The S-400 has a range of about 150 miles to 249 miles.
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On the low end of that range are the 48N6 missiles, which have 315-pound fragmentation warheads and can also hit ballistic missiles across a 37-mile radius.
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On the high end of that range are the 40N6 missiles, but their deployment and true capabilities are unknown.
Russia is also testing the 77N6, designed specifically to take out ballistic missiles with hit-to-kill technology.
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The S-400's radar can detect targets up to about 373 miles away.
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S-400s are currently deployed in Kaliningrad, Syria, and Crimea.
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The CSIS map below shows where Russia's and NATO's air-defense systems are deployed.
You can see the full interactive map here.
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The video below shows the S-400 in action: