They have carried out at least five operations in Crimea. They have also carried out helicopter and drone attacks in Russia. The Russians usually blame the explosions on careless smoking.
So, there is already precedent for operations hitting "Russia Proper".
I think the annexation is Vlad's attempt to get a ceasefire right away.
I don't think the Ukrainians are going to pay attention to him. They have all of the initiative at the moment. The mobilization is a farce.