I doubt the Russians would share their deep-tech with China. There's quite a bit of enmity b/w the two after the Sino-Soviet split; China for much of recent history was US's weapon against Russia (and India). In fact, it was the US that indirectly help built up the US (much like the rest of East Asia).
[I'm generally surprised by how ill-informed western populace is about their own govts doing.]
That may be the case. OTOH, why did Russia build https://en.wikipedia.org/wiki/Vostochny_Cosmodrome almost right next to the border with China? Wouldn't something like that not be of utmost strategic importance?
[I'm generally surprised by how ill-informed western populace is about their own govts doing.]