At that time, under the development of Peter the Great, Russia, Ivan III of Russia and yekaterina, domestic contradictions were lifted, and international power expanded, becoming the most powerful country in the world at that time.
When the Treaty of Nebuchadnezzar Chu was signed, Kangxi had just put down the rebellion in Wu Sangui, and the domestic vitality had not recovered. Everything is still in a state of adjustment, and it does not have the strength to compete with Russia. So the Qing government decided to get away from jaxa as soon as possible, so as to free up energy to deal with Zheng Group and Gedan. On the other hand, the Russian government is building strong cities in jaxa and Nebuchadnezzar, which have been painstakingly managed for many years. Although nominally the territory of the Qing Dynasty, due to the above complicated reasons, Russia became the actual owner of this territory. It is basically impossible not to leave them a foothold in this area. So the Qing Dynasty made concessions and ceded some land to Russia in exchange for peace. Peace in the northeast was vital to the Qing Dynasty.