How did the Kwantung Army come to the Northeast?

1900, Russian troops invaded three northeastern provinces of China for five years on the grounds of "protecting the Middle East Railway". 1904, with the consent of the Qing government, Japan sent troops to the northeast and launched the "Russo-Japanese War".

After a year and a half of fighting, Japan defeated Russia. After the Japanese army drove the Russian troops out of the northeast of China, Japan returned 99% of the land in the northeast to the Great Qing Dynasty. 1905, Japan met with the Qing government. After more than a month of negotiations in Beijing, the Qing government and Japan signed the "Positive Agreement on the Meeting in the Three Northeast Provinces" and its annexes. In this annex, the Qing government ceded the following major sovereignty to Japan as a condition for Japan to withdraw its troops from the northeast, and in Japan's case, it was regarded as a political reward for sending troops to fight against Russia:

1, ceding two leased lands in Lushun and Dalian;

2. Transfer the management right of forest products and mineral products along the Nanman Railway;

3. Allow Japan to station troops on both sides of Nanman Railway.

According to this treaty, Japan began to send people to take over the Nanman Railway, Lushun and Dalian, and stationed troops on both sides of the Nanman Railway. This army, known as "Kwantung Army", was stationed on the grounds of "protecting overseas Chinese in Japan" according to the "Three Northeast Provinces Conference" and the attached agreement.