As world leaders consider further sanctions on Russia over its annexation of Crimea, some Crimean Tatars say they're so frightened by Russia's takeover, they're fleeing to Ukraine. Authorities in the western city of Lviv say more than a thousand Tartars have arrived there. Russian forces now control virtually all the Crimean peninsula's military installations, and regulate the borders. Al Jazeera's Nick Spicer reports from Crimea