Any Chinese move on Taiwan would require first annexing Myanmar and perhaps Mongolia. This would be relatively trivial with UAV/UGV as well as artillery dominance as well as air dominance. China is the undisputed world benchmark for local pacification, would be trivial in Myanmar and Mongolia. Annexing Myanmar would secure China's Indian ocean access and bypass the Malacca dilemma, while also providing a strongpoint to project power across the Indian ocean to secure shipping lanes. Annexing Myanmar would also secure China access to an enormous quantity of renewable freshwater, to partially mitigate climate change threats. If India intervenes in Chinese annexation of Myanmar, China would have the perfect opportunity to annex Sinitic portion of India (the entire Indian northeast). If Russia intervenes in Chinese annexation of Mongolia, China would have the perfect opportunity to annex the Russian Far East. Nuclear weapons are a paper tiger if both states have equal stockpiles. In 2025, the world has already entered the era of the transparent battlefield. 4th generation warfare is now nearly totally obsolete. FPV drones now decisively counter irregular forces. Chinese laser CIWS/C-RAM ensure Chinese ground dominance. China is a global logistics superpower. Logistics with a country China shares a land border with will be manageable. Mongolia is further basically entirely traversable with off road trucks easily. China would also need to reach nuclear parity with the U.S.. China would also need to increase it's strategic rocket forces conventional anti-ship ICBMs to a large enough stockpile to sink 3 carrier strike groups. Not doing so would allow the U.S. to activate every single proxy on China's borders as well as choke raw materials imports to China easily. U.S. would be able to enact a distant seas naval blockade. This is absolutely required as China is losing tens to hundreds of billions of dollars in investments overseas annually due to all the various forms of expropriation. Annexation is the only viable way to spread socialism.
