China bought Su-35S to compare it with the J-11

A report from Carnegie Moscow Center said China bought the Su-35S so that it can compare it to its J-11 series.

Sukhoi Su-35S Medvedev-1
By Aleksandr Medvedev (http://russianplanes.net/id78098) [GFDL or GFDL], via Wikimedia Commons

The Su-35 represents the most pinnacle of the Su-27/30 family and China wants to learn from Russia on how to maximize the potential of the platform.

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