China vs Taiwan, HK, Japan and South Korea in a war.?

First of all I will tell you that all the answers you are going to get is EXTREMELY hypothetical. However, I will do you a favor of giving you my HYPOTHETICAL answer.

In this hypothetical situation every country is prepared for war with its current weapons as of my time of writing, cancelling out Blitzkrieg tactics

Theoretically, China would raze on all those countries. Provided there are NO EXTERNAL ASSISTANCE, China would single-handedly annihililate them albeit hurting its economy.

JAPAN: China would most likely deal with the most dangerous of the 4 which is Japan because it is the one closest to developing nukes and that it is the country with the most number of anti-ballistic missiles. By fiercely bombing(and their missiles can hit Japan) Japan's assets (their limited Patriot missiles would only block so much) like its nuclear plants, air bases and its western docks. By simply doing that, Japan's military is already close to falling apart. Take note they have a SELF-DEFENSE force, not an actual military meaning that they do not have the resources (or few) to do a landing on China's beaches.

With its western side razed China can simply land on it and work their way inwards, taking advantage of its now-demolished military (most of it is committed to the west for war-with-china reasons) and overall older population. Japan has the advantage of mountainous terrain, meaning guerrilla tactics work. However, advanced military can simply bomb them out. This would result in a win without that much casualties for the Chinese.

If they do not intend to take over Japan, an easier way (cruel as well) would be that after extinguishing its interceptor-missile resources, china can and will NUKE Japan till it kneels, targeting financial districts that would make Japan's economy implode.

KOREA The 2nd most dangerous country due to being the 2nd largest military in East Asia(630000+ active). However, the country has a very serious weakness which can be easily exploited: its lack of anti-ballistic missile systems. With this weakness in mind, China can easily exploit it. What's more, Korea is in the range of a normal Chinese jet (with refueling) therefore bombers can easily ravage Korean cities with impunity. A land assault is also possible, but might be costly compared to the more trained and large (6th in the world i think) Korean army.

TAIWAN: We are aware with the fact that china is always prepared for a war with taiwan, with 1000+ missiles pointing at it. With its smaller land mass and overall weaker military, I think it can be safe to say China will eat Taiwan, if not bomb it.

PHILIPPINES: This may come hard, but the philippines has no missile, no tanks, no planes of any kind (ov-10 only), no tactical ships (best ship is world war 2 era coast guard cutter), no strategic radar systems. This would mean that if the country even wishes to win against the country, it would have to result to guerrilla tactics. Choosing to fight would mean total annihilation. Sad to say, china could bomb it, fly over it, and even put ships extremely close to philippine shores and the philippines cannot do anything about it at all.

China Vs Taiwan War

These "what if" and "who wins", questions are turning into an annoyance as these questions are so childish.. Can you understand that hypotheses of hypotheses of hypotheses that are themselves based on a naive assumption lead to nothing bust just useless speculation that has absolutely no link to the real world and its complexities ?

If you want an answer (and are happy to waste time), draw your own scenario and it will be as good as anyone else scenario. And it's not because you're obsessed about this that it's more likely to happen.

You really need to get a hobby, go out into fresh air, have a girlfriend .. or whatever .. rather than thinking about war. Our ancestors (and current servicemen) fought hard to make our land a peaceful land and did not expect to have bored 21st century kids, stuck with their nose against a computer monitor .. and that are bored to such an extend that they actually dream about war.

in my opinion china would devastate all of the other countries you mention (Taiwan, Japan, South Korea and Hong Kong).

However the American and british support won't stop from the moment the Chinese invasion start.

Russia which is China's ally won't stand still watching this happening to its ally, you also have India which is ally with Russia and China will also enter the war against the west!

With all this in the far east, North Korea will find it perfect for its invasion to South Korea and control the whole nation.

The Middle east will be in chaos as Iran will see USA weak in the region because it's supporting the far east front, it will invade the gulf countries with the Syrian and Egyptian Armies fighting Israel.

Europe will be also in chaos as the Russians and Chinese are fighting in it against the EU countries that support USA!

They won't use Nukes unless one of the sides is close to be defeated. at this point it will become the first nuclear world war.

as we all know Russia has around 10000 warhead and USA 7000 which gives Russia more ability to strike USA when it sees that USA is taking heavy damages and sending more troops, the Russians will move there fleets towards USA obviously after controlling Europe. if you looked at Europe you'd find that the European armies without American help are nothing!!

so while iran has controlled the gulf, it'll stop pumping oil to America and its allies which will make them in a big problem and in shortage of gas and oil while the east is full of petrol and gas. India would send troops to protect the gulf with Iranians.

I don't know where turkey will be in this though.

Hopefully this makes difference for you and maybe making it clearer for you.

In the end it's my opinion if you didn't like it.

i'm with Antony