This country successfully tested Russia's S-400 missile air defence sy

1.	This country successfully tested Russia's S-400 missile air defence system worth USD 3 billion.
Answer» China successfully tested Russia's S-400 missile air defence system. It received the last shipments of the weaponry from Russia in July under a USD 3 billion contract signed in 2015. China was the first foreign buyer to seal a government-to-government deal with Russia in 2014 to procure the S-400 missile. It has a supersonic speed of 3 kilometre per second.

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