Via Reuters:

President Vladimir Putin signed laws completing Russia’s annexation of Crimea on Friday, as investors took fright at a U.S. decision to slap sanctions on his inner circle of money men and security officials….

In a Kremlin ceremony shown live on state television, Putin signed a law on ratification of a treaty making Crimea part of Russia as well as legislation creating two new Russian administrative districts: Crimea and the port city of Sevastopol, where Moscow keeps part of its Black Sea fleet.

Putin basically pledged Ни шагу назад! (Not One Step Back) on the annexation.