You have all the powers that Putin currently does. Everyone completely loyal to Putin is now loyal to you. Enemies of Putin are enemies of you. Putin no longer exists, and there has been a clean and absolute transfer of power to you. The economic, military, social and political situations are the same as they now are. You are not inhabiting Putin’s body, you are just you. You’re magically transferred to the Kremlin. The world at large doesn’t know your past life, to them you have magically appeared as the new ruler. To everyone who knew you before, you just vanished.
Edit: no one knows your past life YET. They’ll quickly figure it out. You will not lose any support based on your actions in your past life.
Second scenario Is all about economic health. Can’t pay my cronies if we don’t have money! Russia’s diplomatic past, and its current position, requires an antagonistic relationship. It could be built out so it’s not necessary, but that would take a very long time, more than one generation. However, staged niceness could be negotiated for economic concessions or trade deals. The greatness of Russia would be an exercise in public relations, military victories are not necessary.
Someone knows their keys to power