Russia also advocating anti-vaccination movement [0] for quite a long time already, basically any conspiracy freaks, who can make US existence as a state more complicated.

I'm Russian national myself is any. I do not support our regime of course, and left Russia a while ago. But US being so defenseless in the face of that threat surprising me.

[0] https://www.bbc.com/news/world-us-canada-45294192