From which one of the following countries has India procured the S-400

From which one of the following countries has India procured the S-400 Triumf air defence missile system ?

United Kingdom
U.S.A.
France
Russia
This question was previously asked in
UPSC CDS-2 – 2023
The correct answer is D.
India has procured the S-400 Triumf advanced surface-to-air missile defence system from Russia. The deal for five S-400 regiments was signed in 2018.
The S-400 is a mobile, multi-layered air defence system capable of engaging various aerial targets including aircraft, cruise missiles, and ballistic missiles at ranges up to 400 km. It is one of the most advanced air defence systems currently available.