Nation-states have been plying their adversaries with sex, drugs, and rock and roll since before any of us were born.

There was a reason when I was in Korea that the Russian "girlfriends" (it was basically rented love, let's call it for what it was) were not even allowed on post. Korean girls and Filipina girls, all ok.

I had a troop, who was out processing for the end of their service when I arrived to command, who was no shit married to like a daughter or niece or such of Saddam Hussein. I don't know how this dude had even a secret clearance. If they hadn't been going out, I would have likely called CID and sought to have access pulled.

There's little things too. Just get a picture in a compromising position. Just find out that someone has a certain unsavory hobby, or drinks too much, or does some pills that would show up on urinalysis. Then you sit on that information until you need something. I suspect RU has this on POTUS, and it is Mickey Mouse bullshit but he doesn't want it out there, so he does whatever TF they want.