Russian prime minister and gov't resign after Putin speech
The unexpected announcement, which came shortly after Putin proposed a nationwide vote on sweeping changes that would shift power from the presidency to parliament, means Russia will also get a new prime minister.
Possible candidates include Sergei Sobyanin, the mayor of Moscow, Maxim Oreshkin, the economy minister, or Alexander Novak, the energy minister.
Medvedev made the announcement on state TV sitting next to Putin who thanked Medvedev, a close ally, for his work.
Putin said that Medvedev would take on a new job as deputy head of Russia's Security Council, which Putin chairs.
Putin asked for the outgoing government to remain at work until a new government was appointed.