The idea of Russia as a neutral ISR provider is something I lifted earlier as well and believe is their most optimal role.
However I disagree that NK shouldn't be directly involved. First, NK doesn't really have a choice, unless China explicitly forbids them.
Secondly, opening a 2nd front is not a disadvantage but an advantage for China, which has the land army advantage here.
China will not be using the whole 1.4 million ground forces to defend Taiwan. In the first place, it is impossible to get so many troops there during war. So most of the ground force will sit idle... Unless... They can be used in a conflict on the mainland.
KPA provides all the weight of numbers needed to hold gaps, as well as plenty of battlefield artillery, while PLA can punch through and has huge amounts of precision weaponry.
It is my belief that should America invade China, China should actively strive to create a 2nd front on the Korean peninsula. It should use the overwhelming threat of war and destruction to force Seoul into condemning the American invasion, joining sanctions against America and completely closing airspace to the Americans.
These demands are inherently unequal and painful for Seoul to bear, but their only choice will be between bearing them and staying independent, or get rolled over by a PLA backed by KPA that otherwise would be doing nothing important anyways because China can only transport so much troops to aid the island if US navy is actively hunting the troop transports.
We must think in the worst case scenarios where US succeeds in taking over Taiwan, a conquest of the peninsula will still give China enough strength to stay in the game.
Taiwan is one of China's more important provinces, bordering the sea and having fairly urbanised population. Likewise, South Korea is an important area for westerners, culturally speaking. Therefore, even if the American invasion succeeds, a counter invasion in Korea will serve as an immensely potent rally point for Chinese resistence.
Not really agreeing with the idea regarding Korea.
Firstly,
North Korea is a very useful card for China to play with, which is why Pyongyang and the Kim Dynasty are kept alive until today, and also the reason China would never allow North Korea to collapse. There are also lots of ways China could use North Korea for her own advantage whether there be a war or not, so why should China throw away that card so early and so easily?
Secondly,
fighting a war is a very exhausting affair for just about any country in the world. Just look at how Russia is still struggling with Ukraine that has the backing of the entire NATO - And that is still without direct NATO intervention. I'm not sure how Russia would've hold up to an all-out NATO assault without relying on nuclear weapons to hold them off.
Could anyone have imagined how challenging and difficult it is for China to fight in a major war over Taiwan, especially with the near-absolute guarantee that AR over Taiwan would invite military intervention the US and their allies? Unless Xi Jinping wakes up today and sees that the PLA has twice the size and firepower of their American counterpart, I don't think anyone in the PLA CMC would be eager to open another front that would split their attention and focus away from Taiwan.
Thirdly, if anyone has observed carefully,
South Korea is comparably more benign regarding the Taiwan issue than their Japanese neighbour and their American overlord. You don't often see Seoul making openly confrontational statements and moves against Beijing on Taiwan as much as Tokyo and Washington DC. Therefore, if South Korea can be pressured into not getting directly involved in a hot conflict with China over Taiwan and/or North Korea, why should China not take the opportunity?
Moreover, there is the problem with the
Himalayan frontier - Notice how the Indian foreign policies have been getting more aligned with the West over the last couple of years? The IAF just sent a couple of their fighters for a joint exercise with the JASDF a couple days ago. This is coupled with so many Jai Hinds out there from bottom-to-top in India calling for war with China, and the recent suggestions by the Indian Foreign Minister that they may no longer abide by the One China Principle regarding Taiwan.
Therefore, does anyone believe that in case China is busy with AR over Taiwan, India would definitely keep their hands to themselves and absolutely not trying to open another front with China in the Himalayas - especially if it's the United States that is secretly backing New Delhi to do so in order to divide China's war effort from Taiwan?
Hell, we have all seen that as Russia is stranded in Ukraine, flames were set all across Russia's backyard (we call this 俄罗斯后院起火) - We have Azerbajian picking a fight with Armenia once again; We have Russia getting not so frenzy with her Central Asian neighbours (Kazakhstan in particular); and then there's Turkey who once again invaded Russia's ally, Syria.
So, if China opened a second front in Korea while still fighting in the first front over Taiwan, then suddenly India decided to open a third front in the Himalayas - Could China reasonably and effectively handle all three fronts simultaneously and achieve victory over all three frontiers without suffering catastrophic casualties on her own and/or causing nuclear war?
I afraid not.
This is especially without Russian support and intervention on the Chinese side, as Russia would have been obsessed with security issues in Europe after the ongoing war is over anyways. The only thing I could see Russia be useful for is by dropping nukes on India, but that is something that's very unlikely going to happen.
All-in-all, China is very much alone, when you start to think about it...
Plus, I'm concerned that some of the guys here are getting overconfident with regards to China's warfighting capability against her peer opponents.