The North has perhaps the world's second-largest special operations force, designed for insertion behind the lines in wartime. While the North has a relatively impressive fleet of submarines, its surface fleet has a very limited capability. Its air force has twice the number of aircraft as the South, but, except for a few advanced fighters, the North's air force is obsolete. The North deploys the bulk of its forces well forward, along the demilitarized zone (DMZ). Several North Korean military tunnels under the DMZ were discovered in the 1970s.

Over the last several years, North Korea has moved more of its rear-echelon troops to hardened bunkers closer to the DMZ. Given the proximity of Seoul to the DMZ (some 25 miles), South Korean and U.S. forces are likely to have little warning of any attack. The United States and South Korea continue to believe that the U.S. troop presence in South Korea remains an effective deterrent. North Koreaís nuclear weapons program has also been a source of international tension (see below, Reunification Efforts Since 1971; Denuclearization of the Korean Peninsula).

In 1953, the Military Armistice Commission (MAC) was created to oversee and enforce the terms of the armistice. Over the past decade, North Korea has sought to dismantle the MAC in a push for a new "peace mechanism" on the peninsula. In April 1994, it declared the MAC void and withdrew its representatives.