An aerial view from a helicopter shows residential houses in the Adler district of the Black Sea resort city of Sochi

An aerial view from a helicopter shows residential houses in the Adler district of the Black Sea resort city of Sochi, December 23, 2013. Sochi will host the 2014 Winter Olympic Games in February. Picture taken December 23, 2013. REUTERS/Maxim Shemetov (RUSSIA — Tags: CITYSCAPE BUSINESS SPORT OLYMPICS) — RTX16XC1