More than half of North Korea's armed forces are deployed within 100km (62 miles) of Seoul, the city most vulnerable to a northern attack.

ECONOMIST: The Koreas

The existence and risk of proliferation of weapons-usable fissile material on the Korean Peninsula, and the actions and policies of the Government of North Korea that destabilize the Korean Peninsula and imperil U.S. Armed Forces, allies, and trading partners in the region continue to constitute an unusual and extraordinary threat to the national security, foreign policy, and economy of the United States.

WHITEHOUSE: The White House

It ended at last in an armed truce, a tense and sometimes extremely tenuous standoff between the aggressive, hyper-armed forces of the North at the command of the maniacal Kim Il Sung and the smaller defense forces of South Korea.

CENTERFORSECURITYPOLICY: Center for Security Policy | Must History Repeat Itself? Congress Should Not Invite North Korean Aggression