Tico says
Expelling Russia from Ukraine is not possible because we would have to empty our ammunition stores of all kinds. For example, just to recover Crimea, the USA and Europe would have to hand over more than half of their stock of precision rockets. And then we have nothing left to deter China and the war in that area begins.
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1. What info do you have, in which you can say with confidence that expelling Russia from Ukraine would be that difficult?
2. China invading Taiwan is not imminent. It could happen, but not soon, and most likely much later this decade, if it ever happens. You can bet China is watching what happens with Russia's war in Ukraine.