Why did Japan win the Russo-Japanese War, but the Japanese army was vulnerable to the Soviet Union in World War II?

1, Japan won the Russo-Japanese War, but the victory was not comprehensive. Although Russia ceded the interests of the Far East to Japan, there was no compensation. The Russo-Japanese War left Japan badly weakened, unlike the Sino-Japanese War, when the Qing government lost money, Japan soon came back to life. Japan has not changed its strength for a long time after the Russo-Japanese War. However, during the period of Zhang Gufeng and Nomenkan in World War II, the defeat of the Japanese was not too ugly, and the losses of the Soviets were not small. 45 years really don't mention it. The point is that Japan was completely hollowed out.

2. Japan hasn't changed much from the Russo-Japanese War to World War II, especially in its fighting ideology. There is no essential innovation in weapons and equipment. The first and second five-year plans of the Soviet Union made a great leap in Soviet industry, and mechanized operations became the mainstream thought of the Soviet Union. Related weapons have also been vigorously developed. At the beginning of the war, it had a relative advantage over Japan, and in 45 years it had an absolute advantage over Japan.

3. During the Russo-Japanese War, in order to balance Russia, Britain, America and France strongly supported Japan and gave it great support. In 1930s, Japan was sanctioned by some European powers for invading China, at least it didn't fully support its war. In 45 years, Japan became the public enemy of the whole world. At that time, Japan's last hope was that the Soviet Union would intervene. ...

4. The arrogance of the army. Many posters during the Japanese-Russian period showed that Russia was very arrogant and looked down on the yellow Japanese. In 1930s, Japan was arrogant because of the success of the war of aggression against China and the history of defeating Russia. Intelligence agencies even collect information that is beneficial to them and turn a blind eye to information that shows the strength of the enemy.

Many old Japanese troops have undergone qualitative changes. For example, during the Russo-Japanese War, the Fourth Division, which made great contributions in Lushun, was afraid of the enemy during the Battle of Nomenkan, and soldiers pretended to be sick one after another, so that the joint commanders all went to the infirmary to be doctors.