One of the major problems that China has is their lack of logistical support beyond the South China Sea and the first island chain. Their nuclear sub tech is under developed and not ready for prime time. They have lost a couple of them already that we know of. The last one sank in the harbor. So the idea that China would be able to deploy one of their diesel subs to the Atlantic is not likely. They are trying to rectify this logistical gap by taking over ports through Belt and Road debt traps.

China has all kinds of Russian military tech, but building it and have it actually function is where the problem lies. They lack experiential knowledge that comes from years of research and development. Their people are taught to obey centralized authority to the point that they cannot solve complex problems. They find it difficult to innovate and think outside the box. They want everything quickly to fulfill political goals. Add to this the fact that the entire military industrial chain is highly corrupt and self serving. The Russians unfortunately are finding out the hard way how unreliable Chinese military equipment really is. The reality of China is nothing like the propaganda that they promote.

Thanks for the info fren.