The word troll has evolved to encompass any sort of dishonest internet activity that is designed to manipulate the response and attitude of the larger audience, but I agree: the right term would be astroturfing.
> it's like having a pit-bull in the corner that nobody loves because it defended them before in a savage way
That hilariously fails to describe Russia in any way most people would recognize.
> Realistically, with the exclusion of Crimea, Russia has done nothing that any other large country hasn't done with regards to borders
That's a pretty big exclusion, but concerns about its borders and the threat of annexation - as elevated as it is compared to any other country - is not the main concern here.