After years of successive US administrations concentrating exclusively on the North Korean nuclear issue, the Obama Administration now faces a dangerous situation between the two Koreas. The frequency and severity of North Korean provocations have pushed South Korean President Lee Myung-bak literally against a political wall. South Korean warnings of retaliatory air strikes need to be taken seriously. Larry Niksch discusses the options for South Korea to use military force in a measured response to North Korea's unpredictable aggression

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