Re: What will happen to the Bitcoin network if Russia blocks access to the internet?
Since there will be the main chain and a side chain, would it be possible for some evil people to double spend or try to manipulate because of the lack of communication between the two chains? Previously when china miners shutdown their system, there were no fork problems
The chains would hopefully be made incompatible so this couldn't happen but it likely wouldn't anyway (the Russian chain would remain quite a bit behind).
If the forms are left as compatible main et chains though, the Russian version would not exist once it gets reconnected with other nodes and all of their transactions would be removed from the chain (though there's a chance someone with an archive would be able to push them all into confirming on the main chain).
If Russia disconnects itself from the internet then I think they'll face a lot of negative consequences (not only with bitcoin but with engineering and other advancements too). If they leave even a tiny part of their Internet open and accessible though, it'll probably end up being used by a lot more and in a lot of ways Russia wouldn't be expecting (like how the great firewall of China doesn't really work that well).