Here's another report:
Is China Developing a VSTOL Fighter? - Defense News
The report is complete BS, there is no J-18 and if there is it most definelty is not a STOVL version of the Su-33. For China to make a STOVL version of the SU-33 they would need to redesign it first of all. Also, the SU-33 is incredibly heavy already, if you made it a STOVL aircraft it would literally be one of the heaviest/ if not the heaviest fighter ever created. Plus none of these sources are reliable by any means.
Is China Developing a VSTOL Fighter? - Defense News
The report is complete BS, there is no J-18 and if there is it most definelty is not a STOVL version of the Su-33. For China to make a STOVL version of the SU-33 they would need to redesign it first of all. Also, the SU-33 is incredibly heavy already, if you made it a STOVL aircraft it would literally be one of the heaviest/ if not the heaviest fighter ever created. Plus none of these sources are reliable by any means.