You have none of his knowledge

Me: Hey how do I get out of this building? All these doors have key codes

Guy: Предъявите удостоверение личности, или я вас задержу.

Me: You don’t speak English?

Guy: Пойдём со мной.

Me: Hey let go of me

Me: Ow stop

I get on the first airplane to Europe and apply for political asylum when I get off.

Unless you already have strong connections and relationships with everyone else in the Kremlin you won't last very long.

Nice try, Putin.

You got yourself into this mess, now you gotta figure it out for yourself.

Simple - enforce russia joining the international court of Justice. Afterwards, let yourself and all other russian Government officals be charged by them. When i dont have any knowledge about their wrongdoing, the ICJ surely will have it. Flee to Genf, enjoy your life in prison. You wouldnt be falling out of a window there.

Same way as every single other Russian transition of power in modern history:

Reveal that the previous leader betrayed the Russian people, and you're here to set things right. EVERY transition.

Do I have access to his personal bank accounts?

Someone asked a very similar question yeasterday.

kill anyone opposing me then change the flag and establish democracy.

Jump

A parachute.

Have someone thrown out a window on the 1st day to establish dominance

So I can't speak Russian? That's rough. I guess I'd try to stare everyone down until they get nervous and leave. Sometimes nod when people talk to me, sometimes just walk away from them. Oh no, he's giving me the silent treatment they'll think. Better not make him mad. Let them worry about the windows. Meanwhile I plan my escape through South America to LA where I live as a not-Putin impersonator. Hide in plain sight.

Window tax

Arrest and kill all the oligarchs that were previous Putin Loyalists, replace them with technocrats in a transitional state, institute a federated democratic system.

Anyone who'd want me dead is gone, anyone with power is loyal to me or apathetic on the issue, and the people now see me as a national hero, especially in the resource rich regions mainly inhabited by ethnic minorities who will now likely raise riot if anyone tries to take them back to the old ways.

Also try the patriarch of Novgorod for treason if he tries to pull anything.

Simple:

I'm in charge of Russia.

Suffices for Putin, doesn't it?

~~But yeah no, really, the solution is vodka~~

I nuke Moscow. Can't fall out a window if there are no windows!

If I were in charge, I assume I would be the one making people fall out of Windows, no?