Amazing a small nation like Japan could do what it did to a larger more populous nation like China, but not surprised given the dis-unity, infighting, political tit for tat and backstabbing that took place in China at the time.
Corruption was also a big problem.
The eastern front tied down most of the German army. Some of the best divisions were there as was much of the best equipment. Can’t imagine what D-day and afterwards would have looked like if so much of the German war machine wasn’t in Russia.
China was similar case. A good part of the Japanese war machine was tied up in China. While some of the bloody island battles probably wouldn’t have changed-you can only put so many troops on a small atoll, some of the other battles probably would have been more intense.
