Russia has exported the S-400 to countries other than Turkey and Saudi Arabia. In 2015, China bought six S-400s, and India bought five of them in 2016.
Source: CSIS
The CSIS map below shows where Russia's and NATO's air-defense systems are deployed. (The interactive map is linked below).
You can see the full interactive map here.
Source: CSIS
Below is the S-400's radar, which can detect targets up to about 373 miles.
Source: The National Interest
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.
Source: CSIS
On the low end range of 150 miles are the 48N6 missiles, which have 315-pound fragmentation warheads and can also hit ballistic missiles across a 37-mile radius.
Source: CSIS
However, it does not have hit-to-kill ballistic-missile-defense technology, which means it can't physically collide with incoming warheads.
Source: CSIS
It's capable of taking out aircraft, drones, cruise missiles, and ballistic missiles in the terminal phase.
Source: CSIS
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.
It's also the successor to the S-200 and S-300 air-defense systems, and became operational in 2007.
Source: CSIS
