 Kim Hyon-hui, one of the agents who carried out the bombing of 1987 Korean Air Flight 858, claimed to have spent several months training at Zokwang Trading's office while living in Macau.In her autobiography, "The Tears of My Soul", she wrote that, while living there, she learned Cantonese so that she and other North Korean agents could pose as local Chinese residents.In 1994, the United States government also made accusations that Zokwang Trading were engaged in arms sales and other illegal technology transfer.