First Look North Korean economy fueled by thousands of laborers in US-allied nations

North Korean workers supply the hermit kingdom with hard currency while living abroad in deplorable conditions. Why they may be the secret to the country's survival despite tough international sanctions. 

Kamran Jebreili/AP

As pressure over North Korea's nuclear weapons program grows, the most valued Arab allies to the United States host thousands of its laborers, whose wages help Pyongyang evade sanctions and build the missiles now threatening the US and its Asian partners, officials and analysts say.