North Korea Protests Seizure of Ship By the US at the United Nations
|The fact that the North Koreans are so strongly protesting the seizure of their ship at the UN demonstrates this is an area they are vulnerable:

North Korea’s top envoy to the United Nations (UN) warned that the U.S. seizure of a cargo ship earlier this month could endanger future denuclearization negotiations in a rare news conference in New York on Tuesday.
Joong Ang Ilbo
“The United States should deliberate and think of the consequences that its outrageous act might have on future developments,” Kim Song, the North Korean ambassador to the UN, said at a press conference at the UN headquarters Tuesday. “And also, the United States must return our cargo ship without delay.”
The U.S. Justice Department on May 9 announced it had impounded the 17,061-ton Wise Honest bulk carrier and accused it of exporting North Korean coal in violation of U.S. and UN Security Council sanctions. Along with coal shipments, it was also used to import heavy machinery from Yantai Port in China’s Shandong Province to Nampo Port in North Korea, the Justice Department said.
You can read more at the link, but seizing ships involved in illicit shipments from North Korea is something I have long advocated. After being seized the cargo and the ship itself I believe should be auctioned with the proceeds going to families who have lost loved ones due to North Korea’s terrorism acts over the years.