Flying under a Panamanian flag, the Glory Hope 1 delivered North Korean coal to the port at Cam Pha — also with its tracking device switched off — in late August, according to photos and information American intelligence officials provided to the United Nations.
Taiwanese prosecutors have not publicly disclosed the name or flag of the Chinese-owned vessel involved in the Chiangs’ reported coal shipment to Vietnam.
The father, Chiang Kuo-hua, initially failed to show up for questioning after checking himself into a hospital. Prosecutors have issued a warrant for Mr. Chiang and have applied for detention of the son, Chiang Heng, to prevent him from destroying evidence or speaking with the other defendants. The two other defendants, who have not been named, were released on bail.
The office of Taiwan’s president, Tsai Ing-wen, issued a statement regarding the case, saying that Taiwan “will continue to cooperate with any relevant countries to strictly examine any similar illegal behavior in order to ensure national and regional stability and safety.”
Self-ruled Taiwan is not a member of the United Nations, which it wishes to join but cannot because of opposition by China, which claims it as its own territory. The current government under President Tsai has made a point of adhering to United Nations resolutions in order to make a case for greater international recognition of Taiwan. In September, Ms. Tsai’s government announced it would end all trade with North Korea.
But that does not appear to have halted all Taiwanese trade with North Korea banned under United Nations sanctions.
Last month, Taiwanese prosecutors in the southern city of Kaohsiung detained and released Chen Shih-hsien, who leased a Chinese-owned ship registered in Hong Kong that was spotted by United States drones transferring oil to a North Korean vessel in international waters last October.
Mr. Chen, who maintains his innocence and claims he was framed by Chinese businessmen, made a failed suicide attempt on Jan. 19, the local news media reported.