vesicles
Colonel
Both North and South Korea has regular+ reserve which is larger then PLA's regular+ reserve -- so it may be that PLA is outnumbered initially. If you consider only the regular troops, North Korea + South Korea has around 800K troops -- which will overwhelm troops in Mongolia and Hebei initially. And area north of Beijing are mountainous -- it wouldn't take a lot of troops to block the chicken neck, assuming they can get this far.
It's not the total number of troops that matters, but how many you can put into combat at once. You cannot simply put ALL your troops into China all at once. If China cannot use all of its 2.5 million, Korea can also not use all of its troops. As I mentioned before, only a narrow gap on the Yalu river is passable and only small number of troops can pass it at any given time. The initial attack will be detected almost immediately because China is actively monitoring Korea even as we speak. You can bet that China will be even more vigilant when facing a unified Korea.
As for surprise, while you cannot really mask large troop movement, it can be mask diplomatically. For example, when Korea unifies, it may have excuse to bring up modern divisions from the south to the northern border, if unified Korean falsely announce that it intend to disband the Northern Korean troops. So at least for a short while, the unified Korea can have both South and North Korea army in the North Korea without alarming PLA. Instead of stopping at border, it and drive right through.
No one will buy it! China may not be able to declare war on Korea simply because there is a large troop movement in Korea. However, China won't sit still and watch Korea massing troop along its border. No one in their right mind would do that. The Chinese will find some excuse to get their troops to the location in no time. In fact, China has exactly that a couple years back, sending couple hundred thousand PLA to Yalu.
Assuming it's a total surprise, South Korean can blow pass the under defended border, and go straight for chicken neck, achieving daily advance rate around 150 km a day. If it's lucky, it might get there in around a week. The only PLA troops that can react that fast are the Rapid Reaction Forces in the region, and they are going to be outnumbered. Once the chicken neck is gained, the troops in Shenyang MR can be destroyed in detail by using the reserves -- which need time to call up.
It sounds like day-dreaming to me. This exact scenario could happen if the PLA simply sits still and does nothing. Even without any defense, no army can advance 150km a day. Also, what do you think the PLA is doing when Shenyang MR is being destroyed in detail by using the reserves?? Having parties, or pee in their pants??
I don't know why you are so obsessed with the "chicken neck". Yes, the said area may look thin and small on the map because of the shear size of China in comparison. However, as I mentioned before, the "chicken neck" is wider than the entire length of the unified Korea. It is HUGE. Even if the Korean somehow manage to capture the area, they won't be able to hold it for long. Why? They are walking into a clamp, in what is Liaoning, Jilin and Heilongjiang in the north and Hebei in the south. Both are strong military districts and independent as well. The Manchuria has been called the food pantry of China. They won't starve simply because the "chicken neck" is cut off. And Manchuria has heavy industrial base. They have some of the largest oil fields in China and can also import oil from Russia. They have all the resources to survive anything. So they won't be choked to death because of the loss of the "chicken neck".
On top of that, both Shenyang MR, which includes Laioning, Jilin and Heilongjiang in the north of the "chicken neck", and Beijing MR, which is located in the south of the "chicken neck" are powerful districts because they are in charged of protecting the heavy industrial base in Manchuria and the capitol city of China, respectively. They are no push-over. You are day-dreaming if you think you can defeat these two MR's simultaneously in a land war when you are the one being sandwiched in the middle.
Even IF Koreans somehow manage to capture the "chicken neck", guarding it would be even more difficult because, like I said it many many times before, the so-called "chicken neck" is huge. It would take the entire Korean military to guard the entire length of the neck. That would mean the Korean force would be spread so thin that any meaningful punch from either side of the neck will be able to punch through the defense line. Think about it, a thin thin line of Korean defense vs. highly concentrated and highly focused PLA attacks from either Shenyang MR or Beijing MR, both of which have population over 100 million and both of them bigger than the unified Korea. It's like one Korea in the middle and spread thin fighting two other much bulkier Koreas on two fronts. How do you wish to win that?
And what about other parts of China joining the fight? Like I said before, China's East Sea fleet and South Sea Fleet can both launch attacks on mainland Korea. How can the Korean continue to advance while their home is being bombed to the stone age?
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