Russia exports fuel which they take from the ground. China makes goods from things they import using western know-how and sell them back to the west.
Everybody needs fuel. Rich countries need iphones.
When you are isolated you can still pump oil. You can't make iphones.
These are polar opposites when it comes to dependency on the west.
> The reason is that no-one cares about Taiwan in the West, it is a pawn against China.
I wonder what would be your prediction about the West caring about Ukraine in 2021 :) If anything - even fewer people cared about it than about Taiwan. Yet here we are.
There's 2 things so called "realists" and "geopoliticians" consistently get wrong.
The first is that the only things that matter are economies, armies, nukes, and geography. These people couldn't predict USSR falling, because they thought every culture and every system is the same and values are cosmetic. Meanwhile people like Giedroyć proposed a strategy for Poland after "inevitable USSR collapse and creation of independent Ukraine and Belarus" in 60s already. Look it up - google for "Giedroyć doctrine" and "Kultura paryska".
The second thing "realists" consistently get wrong is assuming democracies are weak and fickle and authocracies are strong and resilient. It's an easy mistake to make, because democracies are transparent about their weaknesses and authocracies hide them. But that's exactly why it's a mistake.
Democracies are actually surprisingly bloodthirsty once you persuade people something is worth fighting for. Much easier to change the mind of the leader than to change the minds of millions of people. And all wars are ultimately about changing somebody's minds.