This is interesting because is the first time I have seen North Korea issue such a warning to a civilian ship in the East Sea. It makes me think they may have thought it was being used for intelligence collection purposes:

A North Korean boat warned a South Korean cargo ship sailing in the international waters of the East Sea to “move out to the open sea” earlier this month, a source said Tuesday, raising maritime safety concerns amid heightened cross-border tensions.
People aboard the North Korean boat gesticulated toward the 30,000-ton cargo ship and sent a message demanding it move farther out into the high seas through an international maritime communication network on May 8, according to the source.
The cargo ship was reportedly carrying 21 crewmembers, including two South Koreans.
It remains unclear whether the North Koreans are civilians or military personnel.
Following the message from the North, the South Korean ship informed its headquarters and the Ministry of Oceans and Fisheries of what happened and took a detour to reach the waters south of the Northern Limit Line, a de facto inter-Korean sea border.
Yonhap
You can read more at the link.









