Can you be more specific? I'd like to learn in what measurable ways he limited presidential power - and how come he got back in power after that, and was able t

Can you be more specific? I'd like to learn in what measurable ways he limited presidential power - and how come he got back in power after that, and was able to continue to add more power to his later presidency? AFAIK Medvedev was wholly controlled by Putin so why would he bother limiting presidential power?