I think you are splitting hairs. If Russian emails are "getting suspended like there's no tomorrow", which certainly seems to be true, then it's pretty hard to make the argument that it has nothing to do with Russian emails. Clearly it does, or perhaps I should say it has to do with Twitter's view of them, the result is the same. If you have PVAs based on Russian emails, you are a target right now. But as I also said upthread, I think it's also based on whatever looks suspicious. Apparently Gmails are also getting hit, and probably for the same reason those Russian emails are as well. Something about accounts created with these types of free accounts inclines Twitter to suspend them disproportionally right now.
Also, actually all of my Ruskie emails are still active. I think they may have been pretty new since I had just bought the pvas a few days before, so account age may well play a role. I also noticed something else peculiar, evidently the guys who built them got a little sloppy, one of my accounts had the wrong login information, it actually logged me in to someone elses account. I wonder if that means anything.