wdym by unstable? You can say whatever you want about Putin, but he's definitely not an idiot.
The next Russian president after Putin will be Sergey Shoygu, I'm 99% sure.
I'm not an expert on Russia, but unstable? I can't really see that in the news cycle either. USA on the other hand have had massive riots for months and 25 000 national guard posted in the capital. The divisive politics that has accelerated with the Trump presidency where the different sides now view each others as (almost) enemies of the state, how are they going to pull themselves up from this? Seems very unstable.