Putin wants the sanctions to be over. His next move will be to create devastation in Ukraine and hold civilians as hostages for the lifting of the sanctions.
In anycase, Russia will controll South of Ukraine, link up with Transnistria and even if they don't take Kyiev and don't force Kyiev into peace negociations, the will secure such a strong position that absolute control won't matter
But why "modern tyranny"? Wars like that are not a novelty... or is it about taking civilians as hostages?
I'd say he's going to invade Moldova in the next few days (once Odessa is taken) and make a big show of how easily they took it to restore morale, and very soon after they're going to plunge in Ukraine's back and make a big push for Kyiev.
I think they might abandon installing a puppet government, but in that case they will bring devastation to Ukraine and keep the whole Black Sea coast, and just let Ucraine fester.