The S-400 is a new-generation, anti-aircraft weapon system capable of engaging any aerial target as well as cruise and tactical ballistic missiles, with a maximum speed of 4.8 km per second, according to Russian media reports.
The system's 40N6 missiles can destroy airborne targets at ranges up to 400 km, state-run China Daily reported.
Anatoly Isaikin, chief executive of the Russian state-run arms trader Rosoboronexport, has confirmed that China has a contract with his company for the purchase of the S-400.
China clinched the deal in September at a cost of more than three billion for the delivery of at least six S-400 battalions, it said.
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The sophisticated air defence system is capable of firing three types of missiles, creating a layered defence, and can simultaneously engage 36 targets.
The system is able to shoot down aircraft and missiles -- ballistic and cruise -- within a range of 400 km, a report in the Diplomat magazine said.
"The S-400 is definitely one of the top anti-aircraft weapons in the world. It will greatly supplement the People's Liberation Army's air defence system, which now has some loopholes in long-range, high-altitude defence of airplanes or ballistic missiles," Wang Ya'nan, deputy editor-in-chief of Aerospace Knowledge magazine, told the daily.