I was just looking at an old China game of my own, and just like here, the invasion of Manchukuo stagnated until I invaded Korea. With a bit of luck, Manchukuo will not be able to supply all the Japanese troops soon to be stuck in their lands when you take Korea, and they'll starve.
But now that you are in the Allies, you can't take Hongkong and Zhanjang back, but there are bigger concerns here, like dealing with Japan.
But now that you are in the Allies, you can't take Hongkong and Zhanjang back, but there are bigger concerns here, like dealing with Japan.