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Waiver to India for purchase of S-400 missile system

GS Paper-2

Syllabus: Effect of policies and politics of developed and developing countries on India’s interests, Indian diaspora.

Source: Live Mint



 US House of Representatives has passed a legislative amendment that approves a waiver to India against the punitive CAATSA sanctions for its purchase of the S-400 missile defence system from Russia to help deter aggressors like China.

  • Ro Khanna, the US representative from California’s 17th congressional district said, “The United States must stand with India in the face of escalating aggression from China.
  • The US has already imposed sanctions on Turkey under the CAATSA for the purchase of a batch of S-400 missile defence systems from Russia.



CAATSA authorises the US administration to impose sanctions on countries that purchase major defence hardware from Russia.

  • Countering America’s Adversaries through Sanctions Act (CAATSA)‘s core objective is to counter Iran, Russia and North Korea through punitive measures.
  • It was passed in 2017 in response to Russia’s annexation of Crimea (2014) and its alleged meddling in the 2016 US presidential elections.
  • Sanctions that may be imposed: prohibition on loans, prohibition of Export-Import bank assistance,  prohibition on procurement of goods or services, denial of visas to persons.


About S-400

  • The S-400 Triumf is a mobile, surface-to-air missile system developed in the 1990s.
  • It is the most dangerous operationally deployed modern long-range SAM (MLR SAM) in the world, considered much ahead of the US-developed Terminal High Altitude Area Defense system (THAAD).
  • India signed a USD 5 billion deal with Russia (in 2018) to buy five units of the S-400 air defence missile systems.


Current Affairs 

Insta Links

India gets S-400 training equipment


Practice Questions

Q. How is the S-400 air defence system technically superior to any other system presently available in the world? (UPSC 2021)


Q. What is “Terminal High Altitude Area Defense (THAAD)”, sometimes seen in the news? (UPSC 2018)

(a) An Israeli radar system

(b) India’s indigenous anti-missile programme

(c) An American anti-missile system

(d) A defence collaboration between Japan and South Korea.

Answer: C


Q. With reference to Agni-IV Missile, which of the following statement(s) is/are correct? (UPSC 2014)

  1. It is surface-to-surface missile.
  2. It is fuelled by liquid propellant only.
  3. It can deliver one tonne nuclear warhead about 7500 km away.

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

Answer: A

Agni-IV is surface-to-surface intermediate-range ballistic missile.


PropellantSolid fuel
Operational range4,000 km
Flight altitude900 kilometres (560 mi)
Guidance systemRing laser gyro inertial navigation system with redundant micro inertial navigation and digital control system