October 13, 2014
From The Battle for Donetsk, one of 36 photos. The main terminal of Donetsk Sergey Prokofiev International Airport, hit by shelling during fighting between pro-Russian rebels and Ukrainian government forces in the town of Donetsk, eastern Ukraine, on October 8, 2014. (AP Photo/Dmitry Lovetsky)

From The Battle for Donetsk, one of 36 photos. The main terminal of Donetsk Sergey Prokofiev International Airport, hit by shelling during fighting between pro-Russian rebels and Ukrainian government forces in the town of Donetsk, eastern Ukraine, on October 8, 2014. (AP Photo/Dmitry Lovetsky)

August 28, 2014
From NATO: Russian Soldiers Operating in Ukraine, one of 42 photos. Ukrainian soldiers detain a man suspected of spying for pro-Russian militants at a checkpoint near Debaltseve, Donetsk region, on August 16, 2014. (Anatolii Stepanov/AFP/Getty Images)

From NATO: Russian Soldiers Operating in Ukraine, one of 42 photos. Ukrainian soldiers detain a man suspected of spying for pro-Russian militants at a checkpoint near Debaltseve, Donetsk region, on August 16, 2014. (Anatolii Stepanov/AFP/Getty Images)

May 7, 2014
From What the Hell Is Going on in Ukraine?, one of 40 photos. A nurse holds a weapon as she helps a wounded pro-Russian gunman to exit a car in front of a hospital in Slovyansk, eastern Ukraine, on May 5, 2014. Ukrainian troops fought pitched gun battles Monday with a pro-Russia militia occupying the eastern city — an apparent escalation of their efforts to bring the region back under government control. (AP Photo/Darko Vojinovic)

From What the Hell Is Going on in Ukraine?, one of 40 photos. A nurse holds a weapon as she helps a wounded pro-Russian gunman to exit a car in front of a hospital in Slovyansk, eastern Ukraine, on May 5, 2014. Ukrainian troops fought pitched gun battles Monday with a pro-Russia militia occupying the eastern city — an apparent escalation of their efforts to bring the region back under government control. (AP Photo/Darko Vojinovic)

April 17, 2014
From Battling for Control of Eastern Ukraine, one of 36 photos. An armed pro-Russian man stands outside the seized mayor’s office in Slaviansk, Ukraine, on April 14, 2014. Towns in eastern Ukraine on Monday braced for military action from government forces as a deadline passed for pro-Russian separatists to disarm and end their occupation of state buildings or face a major “anti-terrorist” operation. (Reuters/Gleb Garanich)

From Battling for Control of Eastern Ukraine, one of 36 photos. An armed pro-Russian man stands outside the seized mayor’s office in Slaviansk, Ukraine, on April 14, 2014. Towns in eastern Ukraine on Monday braced for military action from government forces as a deadline passed for pro-Russian separatists to disarm and end their occupation of state buildings or face a major “anti-terrorist” operation. (Reuters/Gleb Garanich)

March 26, 2014
From St. Petersburg From Above, one of 12 photos. The Church of the Savior on Spilled Blood during a squally autumn morning. The church marks the spot where the reformist Tsar Alexander II was assassinated by a bomb-rolling revolutionary. (Amos Chapple/Rex Features)

From St. Petersburg From Above, one of 12 photos. The Church of the Savior on Spilled Blood during a squally autumn morning. The church marks the spot where the reformist Tsar Alexander II was assassinated by a bomb-rolling revolutionary. (Amos Chapple/Rex Features)

March 11, 2014
From "Believed to Be Russian Soldiers", one of 38 photos. A uniformed man, wearing no insignia or identifying marks, but believed to be a Russian serviceman, stands on guard outside a Ukrainian military base in the village of Perevalnoye outside Simferopol, on March 5, 2014. Ukraine’s foreign minister said his country feels like it’s almost in a state of war after Russian forces took effective control of Ukraine’s Crimean Peninsula. (Reuters/Vasily Fedosenko)

From "Believed to Be Russian Soldiers", one of 38 photos. A uniformed man, wearing no insignia or identifying marks, but believed to be a Russian serviceman, stands on guard outside a Ukrainian military base in the village of Perevalnoye outside Simferopol, on March 5, 2014. Ukraine’s foreign minister said his country feels like it’s almost in a state of war after Russian forces took effective control of Ukraine’s Crimean Peninsula. (Reuters/Vasily Fedosenko)

March 10, 2014
From The 2014 Winter Paralympics, one of 37 photos. Here, Arly Velasquez of Mexico competes in the Men’s Super G Sitting Skiing race, on day two of the 2014 Paralympic Winter Games at Rosa Khutor Alpine Center in Sochi, Russia, on March 9, 2014. (Hannah Peters/Getty Images)

From The 2014 Winter Paralympics, one of 37 photos. Here, Arly Velasquez of Mexico competes in the Men’s Super G Sitting Skiing race, on day two of the 2014 Paralympic Winter Games at Rosa Khutor Alpine Center in Sochi, Russia, on March 9, 2014. (Hannah Peters/Getty Images)

February 11, 2014
From 2014 Sochi Winter Olympics, Part I, one of 42 photos. Here, France’s Sebastian Lacroix soars through the air during a men’s nordic combined training session in the ski jumping stadium at the 2014 Winter Olympics, on February 10, 2014, in Krasnaya Polyana, Russia. (AP Photo/Matthias Schrader)

From 2014 Sochi Winter Olympics, Part I, one of 42 photos. Here, France’s Sebastian Lacroix soars through the air during a men’s nordic combined training session in the ski jumping stadium at the 2014 Winter Olympics, on February 10, 2014, in Krasnaya Polyana, Russia. (AP Photo/Matthias Schrader)

February 7, 2014
From Sochi 2014: The Opening Ceremony, one of 41 photos total.  Fireworks explode after the lighting of the Olympic Cauldron, during the opening ceremony of the 2014 Sochi Winter Olympics, February 7, 2014. (Reuters/Shamil Zhumatov)

From Sochi 2014: The Opening Ceremony, one of 41 photos total. Fireworks explode after the lighting of the Olympic Cauldron, during the opening ceremony of the 2014 Sochi Winter Olympics, February 7, 2014. (Reuters/Shamil Zhumatov)

February 7, 2014
From Sochi 2014: The Opening Ceremony, one of 30 photos so far.  A performance during the opening ceremony in Sochi, on February 7, 2014. (AP Photo/Mark Humphrey)

From Sochi 2014: The Opening Ceremony, one of 30 photos so far. A performance during the opening ceremony in Sochi, on February 7, 2014. (AP Photo/Mark Humphrey)

February 7, 2014
From Sochi 2014: The Opening Ceremony, one of 15 photos so far. Fireworks explode over the Fisht Olympic Stadium at the begining of the Opening Ceremony of the Sochi Winter Olympics on February 7, 2014 in Sochi. (Alexander Nemenov/AFP/Getty Images)

From Sochi 2014: The Opening Ceremony, one of 15 photos so far. Fireworks explode over the Fisht Olympic Stadium at the begining of the Opening Ceremony of the Sochi Winter Olympics on February 7, 2014 in Sochi. (Alexander Nemenov/AFP/Getty Images)

February 6, 2014
From Sochi 2014: Seven Years of Preparation, one of 30 photos. Shelly Gotlieb, Stefi Luxton, Christy Prior and Rebecca Torr, snowboarders from New Zealand, pose for a picture in the Olympic Rings at the Athletes Village ahead of the Sochi 2014 Winter Olympics, on February 4, 2014 in Sochi, Russia. (Adam Pretty/Getty Images)

From Sochi 2014: Seven Years of Preparation, one of 30 photos. Shelly Gotlieb, Stefi Luxton, Christy Prior and Rebecca Torr, snowboarders from New Zealand, pose for a picture in the Olympic Rings at the Athletes Village ahead of the Sochi 2014 Winter Olympics, on February 4, 2014 in Sochi, Russia. (Adam Pretty/Getty Images)

January 3, 2014
From Olympic Torch Relay Heads to Sochi, one of 37 photos. Torch bearers hold Olympic torches during the torch relay in the Far Eastern University on the Russky Island near the port city of Vladivostok, Russia, on November 15, 2013. (AP Photo/Alexander Khitrov)

From Olympic Torch Relay Heads to Sochi, one of 37 photos. Torch bearers hold Olympic torches during the torch relay in the Far Eastern University on the Russky Island near the port city of Vladivostok, Russia, on November 15, 2013. (AP Photo/Alexander Khitrov)

August 23, 2013
From A Year on the Yenisei River, one of 38 photos. A woman poses for a photographer on the bank of the Yenisei River, with the air temperature at about minus 25 degrees Celsius (minus 13 degrees Fahrenheit), outside Russia’s Siberian city of Krasnoyarsk, on January 8, 2013. Yenisei, one of the largest river systems in the world, which rises in Mongolia and flows into the Arctic ocean, is the life-giving artery for the residents populating its banks. (Reuters/Ilya Naymushin)

From A Year on the Yenisei River, one of 38 photos. A woman poses for a photographer on the bank of the Yenisei River, with the air temperature at about minus 25 degrees Celsius (minus 13 degrees Fahrenheit), outside Russia’s Siberian city of Krasnoyarsk, on January 8, 2013. Yenisei, one of the largest river systems in the world, which rises in Mongolia and flows into the Arctic ocean, is the life-giving artery for the residents populating its banks. (Reuters/Ilya Naymushin)

February 27, 2013
From A Siberian Winter, one of 31 photos. Here, a man walks through a tunnel formed by ice crystals from surrounding permafrost, outside the village of Tomtor in the Oymyakon valley in northeast Russia, on January 28, 2013. The coldest temperatures in the northern hemisphere since the beginning of the 20th century were recorded in the Oymyakon valley, known as the northern “Pole of Cold”, reaching a temperature of -67.8 degrees Celsius (-90 degrees Fahrenheit) in 1933. (Reuters/Maxim Shemetov)

From A Siberian Winter, one of 31 photos. Here, a man walks through a tunnel formed by ice crystals from surrounding permafrost, outside the village of Tomtor in the Oymyakon valley in northeast Russia, on January 28, 2013. The coldest temperatures in the northern hemisphere since the beginning of the 20th century were recorded in the Oymyakon valley, known as the northern “Pole of Cold”, reaching a temperature of -67.8 degrees Celsius (-90 degrees Fahrenheit) in 1933. (Reuters/Maxim Shemetov)