What a weak cover story. Why would the Ukraine be wanting to buy North Korean Weapons? I’m sure the Chinese would sell them anything the Russians would not. So would others. Or for this kind of stuff, they probably make their own.
However, those aging FSU-bloc chaps are not going to be suicidal like North Korean agents, but would sing like Eastern European canaries. Then give them each maybe one year or so in the Thai slammer, and they will never do it again I am sure, and we will get a pretty nice treasure trove of intel on the Norkies regarding these black ops flights around Asia.