(WASHINGTON TIMES) The U.S. would oust the communist regime in North Korea if it uses its nuclear weapons or launches an all-out invasion on South Korea and the 28,500 American troops stationed there, national security sources say.

The Obama administration has not articulated such a far-reaching retaliation, even as North Korean leader Kim Jong-un threatens to attack both the South Korean and the U.S. mainland.

But national security sources say it is a common assumption within the Pentagon and U.S. Pacific Command that a full-force attack by Pyongyang would put in place a contingency plan of massive retaliation against the North aimed at bringing down the Stalinist regime. President Obama then would be faced with making the war decision.

What should be done about North Korea threat?

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