India has begun work on deploying the first regiment of S-400 ‘Triumf’ surface-to-air missile systems purchased from Russia, The Hindustan Times reported on Monday, citing sources. This reported by TASS.

The first S-400 unit will be made operational in early April. Overall, India intends to deploy five S-400 regiments purchased from Russia, it said.

"All the five units of the S-400 system, which can take down a hostile aircraft or missile at a range between 40 km and 400 km, are expected to be operational by next year, the paper said.

All the five units of the S-400 missile systems will be deployed to tackle the threat from China, it said.