Why did China sign the Nuclear Non-Proliferation Treaty at the United Nations? He also said that China could not be the first to use nuclear weapons. Why did he do it?

2. Not to use nuclear weapons first, the first purpose is to show good intentions, and the second purpose is to show weakness, telling the United States and the Soviet Union that I won't use it to hit you. You don't have to be afraid, don't consider using it to hit me;

There is no way. Who makes us weak? If we are as powerful as the United States, we will also say that we are the first country to use nuclear weapons, and we will also take the initiative to attack potential threats!