Proof? I've been spotting Russian trolls since 2014 and even though most of us are smart enough to not buy it there's still a lot of gullible people out there.
And? I have been considered a troll here for a while, even though living in New York (well, Stamford CT now). And what's the real influence on results of these "trolls"? 0.01%? I don't think Russian state will spend any resources on such activities. And even if some countries do - well, their influence is meaningless statistical noise, and you will waste a lot more resources and create yourself more problems than if you just leave this matter alone.
Meanwhile, Russia has its own problems to deal with but they waste resources on destabilizing a country that in the end could end up hurting Russia and others.
Which country are you talking about here? Syria? Ukraine? In both of those cases, Russian politics is very resource-savvy. Ukraine is hung off EU financially, and continues to cause political problems in the USA. Today's Ukrainian regime is solely a Democratic party creation, and if this regime (with all its corruption scandals) plays the key role in shooting Dems down and Trump's victory, I will be laughing very hard for a very long time. In Syria, all they have is one base with a few dozens planes on it really, not much more.
Punishment? Crack down on Russian money laundering. Not this half assed shit we do. The Russian people don't need punishment, but the mafia state that is the government does.
Putin has been trying to crack money laundering and have Russian business to keep their assets in Russia since like his first term, early 2000s. And he didn't have much success until the sanctions, after which the interest of Russian businesses to keep their assets in Western jurisdictions went down. Any further steps in this direction will provide him more help than harm. I do see that what you do looks half-assed, but there is simply not much more left that would not hurt American interests. And there is no point in imposing sanctions that hurt American interests and do not hurt anyone else's - agree?