BTW in the mid1990s, I did a U.N. mission with an Army/former KGB officer. You’d have never known from the way he acted. We only knew because the other 2 Russians told us. Once we knew, he admitted it and told us a lot of stories. One of the most interesting foreign military guys I ever met.
Once we found out we reported it to the U.S. military command we were assigned to during the mission. They verified it and sent someone out to brief all the U.S. military in the mission on what, how, who, etc. when it came to interacting with him. They said “once KGB, always KGB” no matter what was claimed.
I also figured out one of the other Russians (Navy) was a former submariner and had been a crew member on a boomer I had tracked in the late 1980s.