As Sochi, Russia, prepares to host the 2014 Olympic Games, workers walk past piles of dirt at the construction site of Fisht Stadium and Olympic Park on May 20.
A column of Russia's T-90 tanks rumbles over the cobblestones in Moscow's Red Square on May 9 during the country's Victory Day parade celebrating the anniversary of its costly victory over Nazi Germany in World War II.
Yuri Kadobnov/AFP/Getty Images
Investigators work at the site of a bombing in the Dagestan capital, Makhachkala, last year. The blasts near a police post killed at least 15 people. The southern Russian republic has seen persistent violence.
In this image taken from a cellphone video, the father of the Boston bombing suspects, Anzor Tsarnaev, talks to the media about his sons, in his home in Makhachkala, the Dagestani capital, on Friday.