The US, Russia, Great Britain, France, China and (recently) India have nuclear submarines.
no
They share a border. Being such a big country a nuclear bomb can be used against them without bothering their neighbor countries. This puts them in a critical position.
India and China
No, China is not a nuclear-free zone. China possesses nuclear weapons and is one of the five recognized nuclear-weapon states under the Treaty on the Non-Proliferation of Nuclear Weapons.
China shares its northern border with countries like Mongolia, Russia, Kazakhstan, and North Korea.
China is the neighbor of both North Korea and Vietnam.
Around 400 nuclear warheads. China has the third largest nuclear arsenal in the world.
China has a number of nuclear plants. Which one do you mean?
China National Nuclear Corporation was created in 1988.
Yes, because China has nuclear power plants and nuclear weapons.
What is China's northern neighbor that occupies 13 percent of east asias land?