Yep, I was just going off the hypothetical which seems to be just Japan vs China. If just Japan on their own, Japan loses.
Actually EagleEye did a pretty good wrap-up of how things stand, so I will just add a few things into the mix.
Do not expect Japan to be an agressor, if there is a war it will be a case of China attacking Japan. And this has
fail written all over it in big bold letters.
I mean, just look at the order of battle for Operation Downfall. The entire First Army was expected to be the first wave (200,000 Soldiers and Marines), followed by the Sixth Army, with the Eight Army in reserve (another 200-250,000). Within the first week a million Soldiers and Marines were expected to have landed on Japan.
And the landings were to be supported by 3 US Battle Fleets (Third, Sixth and Seventh). And between them they had over 50 aircraft carriers. 9 Battleships, over 500 destroyers, and well over 1,000 amphibious warfare ships.
In addition, it would be supported by the Fifth, Seventh, Eighth, Thirteenth, and Twentieth Air Forces (consisting of over 2,500 heavy bombers).
This is a real-life buildup for an invasion of Japan. And even this was a questionable number of forces, and losses would have been heavy.
And somebody honestly expects me to believe that China could pull it off now with it's tiny navy, limited amphibious forces, and almost total inexperience?
Here is what would happen in RL if this was tried.
Japanese and American intelligence watches the build-up and loading of the ships with growing concern, messages fly back and forth between the 3 countries.
The ships set sail, and the US and Japan go to the UN demanding them to be stopped. They set up a blackade line, and state that any ships loaded with soldiers or war supplies that cross this line will be seen as an act of war. Meanwhile all available ships in the Indian and Pacific Oceans are surged to the area. Soldiers and Marines flood into Mainland and Okinawa, as Kadena starts to burst at the seams with the number of aircract. PATRIOT and THAAD batteries are rushed in from stateside.
Trailing the fleet are several US subs, tasked with only following them. Overhead you have US aircraft on a constant CAP.
Now I bet that this will be much like the Cuban Missile Crisis at this point. The Chinese fleet nears the blockade point, and knowing that it is badly outweighted, they will turn around and head for home. And if they do not, then expect a lot of centotaphs to appear all over China in the next year. Because in a naval engagement, China has little to no hope of defeating a joint Japanese-US task force. One side will have heavy bombers, and many different classes of aircraft (including AWACS). The other will have some helicopters, and land based that will be at the edge of their operating limits.