North Korea says it carried out an underground nuclear test, prompting widespread international concern. Pyongyang says the device that it detonated was more powerful than a previous one tested in 2006. Meanwhile, a news agency in South Korea says the country also test-fired a total of three short-range missiles. The Takeaway is joined by Dr. Jim Walsh, a specialist in international security and a research associate at the M.I.T's Securities Studies Program
"Normally we would have thought of this as bargaining behavior, but North Korea is trying to create a crisis to improve their leverage going into a negotiation."
—MIT Security Studies Professor Jim Walsh on North Korea's motivation to test nuclear missiles