We knew about the Chengdu J-20—China's fifth generation stealth fighter. As it turns out, it's not the only one. According to China Defense Blog, this is the J-21/J31. It looks even more like the F-22 Raptor than the Chengdu.

China Defense Blog says that this new plane is being developed by tChina's 601 Aircraft Design Institute/Shenyang Aircraft Corporation. It appears to be the very first flying prototype, serial 001.

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As if we didn't have enough problems with China developing one stealth plane, now they have two in the works. And in a quite advanced state, according to these photos. [CDB and CDB]