Why in news?
The United States has recently imposed sanctions on Turkey over Ankara’s acquisition of Russian S-400 air defence systems.
What is the significance?
What is the S-400 air defence missile system?
Why does India need it?
What is CAATSA, and how does it affect S-400 deal?
How does this affect India?
What about India-U.S. ties and the waiver offered?
Source: The Indian Express