Putin is already an old man, he was pumped with Botox, and it is not clear what he is doing there at all. Most likely he does not decide anything even in the executive branch, only as a media person.
He really could have been in power until 2012, when he was the chairman of the ruling party. But even at that time he couldn't decide everything. For example, he tried to subordinate the Central Bank to the executive branch, and nothing came of it. Outside the ruling party, he does not decide anything at all, he only executes.
The power of the president in the Russian Federation is weaker than in the United States, he does not even have a pocket veto.