Military muscle-flexing in North Korea: Breaking down the latest spate of missile launches

North Korea's latest spate of missile launches has put its neighbours on edge. The barrage of weapons tests includes one that flew over Japan in the longest-ever recorded distance, capable of reaching the US territory of Guam. The latest show of force comes after Kim Jong Un's regime passed a law outlining conditions for launching a pre-emptive nuclear strike. For more, we speak to Erik Mobrand, the Korea policy chair at the US defence think tank RAND Corporation.