Can China's borders enter and exit at will?

It is out of the question. Crossing the border is illegal, which counts as smuggling, but residents near the border can cross the border with their documents and must come back the same day, in order to take care of small businesses.

China is the country with the longest land border and the largest number of neighboring countries in the world, and it is also one of the countries with the most complicated border situation. The total length of its land border is over 22,000 kilometers, and it borders North Korea, Russia, Mongolia, Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, Pakistan, India, Nepal, Bhutan, Myanmar, Laos and Vietnam in a counterclockwise order.