Siberia?
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https://thehill.com/opinion/international/5379824-china-wants-to-invade-siberia-not-taiwan/
The article, citing a NYT report, argues that China may invade Siberia before it invades Taiwan; reasons being:
- War with Taiwan will be very costly to all sides
- Siberia has lots of natural resources that China needs
- Russian defense are weakened and distracted by the war with Ukraine
Thus, the argument goes that while Taiwan "unification" remains a useful rhetoric, Siberia makes a lower cost, higher return target for China if it were to invade somebody.
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The scenario has been around for some time. It is plausible - particularly if Moscow chooses to become more like North Korea as opposed to the current ersatz Imperial Russia - although why would China take that route when it can ensure Russia remains very much its junior partner through economic means?
Agree with Mik though, if such a scenario were to play out, the nuclear threshold would be crossed very quickly.