In this Sept. 4, 2017, photo, workers at a seafood processing plant where North Korean workers are distinguished from the Chinese workers by blue overalls wash up after work in the city of Hunchun, in northeastern China’s Jilin province. At
In this Sept. 4, 2017, photo, workers at a seafood processing plant where North Korean workers are distinguished from the Chinese workers by blue overalls wash up after work in the city of Hunchun, in northeastern China’s Jilin province. At a time when North Korea faces sanctions on many exports, it sends of tens of thousands of workers worldwide bringing in revenue estimated at anywhere from $200 million to $500 million. That could account for a sizable portion of its nuclear weapons and missile programs, which South Korea says has cost well over $1 billion. (AP Photo/Ng Han Guan)