this is not a cartoon or fiction. I don't think it works like a button being there on his desk. I do admit I think there is a staff behind it, but the important part is Putin exercises absolute control and power over this staff. They cannot object to him. They are possibly even indoctrinated into absolute cult-like loyalty to believe every word of his mouth. Otherwise, someone as paranoid as him would not trust anyone else with nukes.
And if they aren't, we know Putin's favorite tactic is torture and murder into compliance. If someone said they were going to flay you and your family alive unless you do [insert], you would do it.