Context:
India has received the fourth squadron of the Russian-made S-400 air defence system, strengthening its long-range air defence network.

Explanation:
- S-400 Triumf is a long-range surface-to-air missile system developed by Russia.
- It is designed to detect, track and destroy aircraft, drones, cruise missiles and ballistic missiles.
- The system is significant for India’s security because it can provide layered defence against threats from hostile aircraft and missiles.
- The S-400 deal reflects the continuing importance of India-Russia defence cooperation despite the Russia-Ukraine conflict.
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