Apparently not all of them have disappeared. There's a partisan movement there in the occupied Crimea, and their work if very effective. Just recently the resistance organization ATESH(ATEШ) took responsibility for for burning down a Russian military bases in Crimea [...]
Do you really evaluate the "effectiveness of the partisans" according to messages in anonymous telegram chats (where they always write only the truth and nothing else, lol)?
Is this some kind of sophisticated form of trolling, or are you serious about this?