1. according to the Hague international convention, it is an infringement of the sovereignty of other countries for military and police personnel to enter the territory of other countries to engage in official acts. Not only China police can't go to other countries to arrest people, but also police from other countries can't go to China to arrest people.

2. To obtain the permission of the country concerned, it is necessary to cooperate with the police of the country concerned, so it is impossible to enforce the law alone and there is no law enforcement power. You will be arrested when you return to China.