I just want to know why Japan occupied Northeast China first.

1. Because at that time, Japan had occupied Korea, and Korea bordered the northeast of China, so it was easy to go to the northeast next! Moreover, the northeast was rich in various resources at that time. At the same time, the Japanese have a large number of immigrants in the northeast of China, which is more suitable for rule. After the death of the Qing government, Northeast China, as the birthplace of the Manchu dynasty, is also suitable for cultivating its own puppet regime.

2. After the Russo-Japanese War, Russia lost a lot of interests in Northeast China, and Japan did not have more conflicts of interests with other countries in Northeast China, so Northeast China is the most suitable to invade first.

After Japan invaded the Northeast, it could go south to the Central Plains and north to the Soviet Union, and its geographical position was also very favorable.