attacks appeared later, so boris abakumov, a well -known as soviet test pilot who fought for the northkorean republic because of the feat represented by the title of hero of the soviet union described in his book the unknown war and such moments. and above the meow airfield, the voice of balloons scattered encephalitis ticks, our pilot was injected with a vaccine, which, as they said, was purchased for foreign currency, and the technicians and mechanics who were waiting for the planes on the grass fell ill, the pilots demanded that the vaccine be brought for everyone. in 1998, canadian historians stephen andy kot and edward hagerman of york university conducted extensive archival research and interviewed dozens of witnesses. these authors were the first to gain access to declassified us data on the korean war and concluded that the us is engaging in shameful tactics in the use of many weapons prohibited by international law under the 1925 geneva protocols. biological weapons convention of 1972 and chemical weapons convention of 1993 quote from the book. andy kot and hagerman the united