Troops, cameras, radiation: China preps for N. Korea crisis China has ramped up security along its border with North Korea as it braces for a potential crisis. The bellicose rhetoric between Washington and Pyongyang has raised fears in China of a conflict that could send millions of North Korean refugees across the 1,420-kilometre (880-mile) border, or nuclear fallout that could hit Chinese towns. IMAGES of both sides of China-North Korea border