Reality is Russia is the largest and probably most resource rich nation on Earth. China is quite a bit smaller and not as resource rich.
There are about 165 million Russians, there are 1.4 billion Chinese.
Russians should be worried.
What makes you think they are not?
Siberia is now 75% Asian. I believe that's why Vlad is giving out free land there to Euros and N. Americans.
One catch though, you have to accept Russian citizenship.
The reason being, IMO, you can be drafted to their army when the SHTF.
China views Russia as a future part of China.