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"North and South Korea have never signed a formal peace treaty and thus are still officially at war; only a ceasefire was declared. South Korea's government came to be dominated by its military and a relative peace was punctuated by border skirmishes and assassination attempts. The North failed in several assassination attempts on South Korean leaders, most notably in 1968, 1974 and 1983; tunnels were frequently found under the DMZ and war nearly broke out over the axe murder incident at Panmunjeom in 1976. In 1973, extremely secret, high-level contacts began to be conducted through the offices of the Red Cross, but ended after the Panmunjeom incident with little progress having been made and the idea that the two Koreas would join international organisations separately.

In the late 1990s, with the South having transitioned to democracy, the success of the Nordpolitik policy, and power in the North having been taken up by Kim Il-sung's son Kim Jong-il, the two nations began to engage publicly for the first time, with the South declaring its Sunshine Policy.

Tension with North Korea threaten lives and slowing down economic growth, because the risk of war makes capital more expensive."

Source:http://en.wikipedia.org/wiki/North_Korea