Yea, this is what China calls itself. Since around the 8th century, apparently.
The second superpower in the Rigasian Timeline. Similarly to our timeline they went through a series of popular revolutions that ended with a total change of their government system, but things are quite different otherwise.
Since what in our world became the USSR fragmented before even getting started, and Zhongguo was in a slightly better start position, they ended becoming the superpower that leads the half of the world that Rigasia doesn't.
In Session 3 it was announced that they had managed to build their own working version of the Bomb.