Which country developed the S-400 Triumf air defence system?

Russia. The correct answer is Russia. CSIS lists Russia as the origin of the S-400 Triumf, and the system has been in Russian service since 2007. China is wrong because it is a buyer, not the maker. The United States is wrong because its rival systems are Patriot and THAAD. France is wrong because CSIS names Russia as the origin and no French link. Memory hook: the S-400 is Russia's rough match for America's Patriot. Read more: S-400 Air Defence System: Technical Superiority and Significance, Terminal High Altitude Area Defense (THAAD), Missile Technology Programmes.

India and Russia welcomed the contract for the S-400 in a joint statement on which date?

5 October 2018. The correct answer is 5 October 2018. Defence Post quotes the joint statement of that day welcoming the conclusion of the contract. 14 December 2020 is wrong because that is when the US sanctioned Turkey over its S-400. 27 March 2026 is wrong because that is when the Defence Acquisition Council cleared more S-400 systems. 23 July 2026 is wrong because that is the Kusha maiden flight-test. Memory hook: the deal is 2018, the extras came in 2026. Read more: S-400 Air Defence System: Technical Superiority and Significance, Missile Technology Programmes.

Which missile system did DRDO flight-test for the first time on 23 July 2026 from APJ Abdul Kalam Island?

Kusha. The correct answer is Kusha. PIB says DRDO made the maiden flight-test of the Kusha long-range surface-to-air missile on that day. Akash is wrong because it is a short-range system already in use. NASM-MR is wrong because its maiden test was in the June 2026 round. The ballistic missile defence interceptors are wrong because they were tested on 10 and 11 June 2026. Memory hook: Kusha is the July test, the rest were June. Read more: S-400 Air Defence System: Technical Superiority and Significance, Mission Sudarshan Chakra.

A report of 3 June 2026 said the fourth of India's five contracted S-400 squadrons had arrived. How many squadrons had reached India by then?

4. The correct answer is four. India TV, citing ANI, says the fourth of the five contracted squadrons reached India by sea. Two is wrong because three had been delivered before the fourth. Three is wrong because that is the number reported as operational. Five is wrong because that is the number contracted in 2018. Memory hook: five signed, four arrived, three operational. Read more: S-400 Air Defence System: Technical Superiority and Significance, Missile Technology Programmes.

According to the US Missile Defense Agency, what is THAAD's main job?

Intercepting ballistic missiles in their final phase of flight. The correct answer is intercepting ballistic missiles in their final phase of flight. The agency says THAAD does this inside or just outside the atmosphere. Engaging aircraft and cruise missiles out to 400 km is wrong because that describes the S-400. Short-range air defence is wrong because that is the Akash role. Striking ships at medium range is wrong because that is the NASM-MR role. Memory hook: THAAD is the terminal-phase specialist. Read more: S-400 Air Defence System: Technical Superiority and Significance, Terminal High Altitude Area Defense (THAAD), Ballistic Missile Defence Programme.

What is the longest missile range listed for the S-400 system?

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