Japanese aggression toward china and russia in the 1930s is most closely related to the concept of

imperialism

Explanation:

The Japanese made lot of reforms, and some of those reforms were the political views, and the military. The Japanese leaders were well aware that in order to make Japan a very strong nation they need a lot of natural resources int their possession. This meant that they needed to occupy new territories. For this purpose, the Japanese modernized their military, and made it one of the strongest in its time. Once they thought they are powerful enough, the Japanese started to launch attacks on Russia, and then on China, marking the beginning of the Japanese imperialism. The island nation was very successful in its imperialist goals, managing to occupy parts of China, some Russia islands, Korea, large portion of Southeast Asia, and thousands of Pacific islands.

explanation:

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