Second Russian Spy Got Identified

https://www.bellingcat.com/news/uk-and-europe/2018/10/09/full-report-skripal-poisoning-suspect-dr-alexander-mishkin-hero-russia/

what is worst, he is a medical doctor. Russian doctors swear hippocratic oath, forbidding them to harm people. So that shows the value of Russian promise. "Contracts with the Russians are not worth the paper" -- Bismarck

Someone give me a quick rundown on this spy shit. I can't be bothered to read several articles trying to work out what is going on