Despite of harsh international sanctions, North Korea stubbornly sticks to advancement of its nuclear program. Once North Korea possesses nuclear bombs and develops adequate delivery system to threat the United States, it believes that the United States could not but sitting at the negotiation table with Pyongyang and eventually accommodates North Korea’s perennial demands---(1) recognition of North Korea as a nuclear-power state a la Pakistan, (2) signing US-DPRK peace treaty, and (3) large-scale economic aid from the United States. North Korea believes that the United States is more concerned about non-proliferation than denuclearization of North Korea. Thus North Korea thinks it can bargain with the United States with non-proliferation card. For the United States, North Korea’s nuclear weapon program is a mere political issue, since it does not feel threatened by several primitive bombs North Korea would possess. Such bombs however are sufficient to give unbearable threat to South Korea. Thus South Korea can not tolerate nuclearized North Korea. It should develop its own reliable deterring military measures to nullify North Korean WMD arsenal. Also South Korea should enhance its diplomatic efforts to strengthen existing joint deterrence system with the United States. Additionally South Korea should consider active engagement policy to cool down North Korea’s belligerency. Policy of strategic patience should be replaced by that of that of proactive politico-military deterrence.