VX can be administered by untrained "assassins", or perhaps ignorant dupes, be easily smuggled across borders and have a very high likelihood of success. The DP

VX can be administered by untrained "assassins", or perhaps ignorant dupes, be easily smuggled across borders and have a very high likelihood of success. The DPRK tried to hide the evidence of the poison by attempting to prohibit medical access to the corpse, but it didn't work. Maybe they thought they could get away with it. Maybe they thought it was worth the risk of being exposed. Maybe they wanted to send a message. Who knows?