In this photo taken Oct. 25, 2010, Yakutian horses gather at the Pleistocene Park, a 40,000 acre wilderness in northern Siberia, Russia, where Russian scientist Sergey Zimov is trying to recreate conditions from the end of the Ice Age. Zimov believes populating Siberia with grass-eating animals will regenerate grasslands, which are more effective at preventing the thaw of permafrost and slowing the emission of dangerous greenhouse gases. (AP Photo/Arthur Max) Read more →

In this photo taken Oct. 25, 2010, Yakutian horses gather at the Pleistocene Park, a 40,000 acre wilderness in northern Siberia, Russia, where Russian scientist Sergey Zimov is trying to recreate conditions from the end of the Ice Age. Zimov believes populating Siberia with grass-eating animals will regenerate grasslands, which are more effective at preventing the thaw of permafrost and slowing the emission of dangerous greenhouse gases. (AP Photo/Arthur Max)

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A municipal worker clears away autumnal leaves as the first snow of winter blankets the ground in a park in Moscow, Russia, Friday, Oct. 29, 2010. (AP Photo/Alexander Zemlianichenko)

A municipal worker clears away autumnal leaves as the first snow of winter blankets the ground in a park in Moscow, Russia, Friday, Oct. 29, 2010. (AP Photo/Alexander Zemlianichenko)

Car traffic is seen on a highway during sunset in Moscow, Russia, Monday, Oct. 18, 2010 (AP Photo/Sergey Ponomarev)

Car traffic is seen on a highway during sunset in Moscow, Russia, Monday, Oct. 18, 2010 (AP Photo/Sergey Ponomarev)

A member of the Kremlin regiment and Kremlin Horse Riding School is seen during a rehearsal in Red Square in Moscow, Russia, Monday, Aug. 30, 2010. The Spassky Tower festival opens on Saturday. (AP Photo/Misha Japaridze)

A member of the Kremlin regiment and Kremlin Horse Riding School is seen during a rehearsal in Red Square in Moscow, Russia, Monday, Aug. 30, 2010. The Spassky Tower festival opens on Saturday. (AP Photo/Misha Japaridze)

A polar bear has a bucket on his head while a cub polar bear swims nearby in the cooling waters of Moscow Zoo, on Wednesday, July 21, 2010. A heat wave hit central Russia breaking temperature records going higher than 30°C (86°F) for the last two weeks. (AP Photo/Misha Japaridze)

A polar bear has a bucket on his head while a cub polar bear swims nearby in the cooling waters of Moscow Zoo, on Wednesday, July 21, 2010. A heat wave hit central Russia breaking temperature records going higher than 30°C (86°F) for the last two weeks. (AP Photo/Misha Japaridze)

A polar bear swims in the cool waters of Moscow Zoo, on Wednesday, July 21, 2010. A heat wave hit central Russia breaking temperature records going higher than 30 C (86 F) for the last two weeks. (AP Photo/Misha Japaridze)

A polar bear swims in the cool waters of Moscow Zoo, on Wednesday, July 21, 2010. A heat wave hit central Russia breaking temperature records going higher than 30 C (86 F) for the last two weeks. (AP Photo/Misha Japaridze)

This undated image taken from the Russian social networking website Odnoklassniki shows a woman journalists have identified as Anna Chapman, who appeared at a hearing Monday, June 28, 2010 in New York federal court. Chapman, along with 10 others, was arrested on charges of conspiracy to act as an agent of a foreign government without notifying the U.S. attorney general. (AP Photo) Read more →

This undated image taken from the Russian social networking website Odnoklassniki shows a woman journalists have identified as Anna Chapman, who appeared at a hearing Monday, June 28, 2010 in New York federal court. Chapman, along with 10 others, was arrested on charges of conspiracy to act as an agent of a foreign government without notifying the U.S. attorney general. (AP Photo)

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In this May 24, 2010 photo made available Wednesday, June 2, 2010, researchers test spacesuits on a simulated Mars surface during a training session at Moscow’s Institute for Medical and Biological Problems. An international crew will launch a 520-day mission to simulate a flight to Mars on Thursday. (AP Photo/IBMP, Oleg Voloshin, HO) Read more →

In this May 24, 2010 photo made available Wednesday, June 2, 2010, researchers test spacesuits on a simulated Mars surface during a training session at Moscow’s Institute for Medical and Biological Problems. An international crew will launch a 520-day mission to simulate a flight to Mars on Thursday. (AP Photo/IBMP, Oleg Voloshin, HO)

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Russian school graduates jump in the Red Square celebrating the last day of classes in Moscow, Tuesday, May 25, 2010. (AP Photo/Misha Japaridze)

Russian school graduates jump in the Red Square celebrating the last day of classes in Moscow, Tuesday, May 25, 2010. (AP Photo/Misha Japaridze)

Russian fighter jets leave a smoke trail in the colors of the state flag, as they fly over the Kremlin during general rehearsals ahead of the upcoming Victory Day Parade, in Moscow, on Thursday, May 6, 2010. Russians celebrate Victory in WWII on May 9. (AP Photo/Misha Japaridze)

Russian fighter jets leave a smoke trail in the colors of the state flag, as they fly over the Kremlin during general rehearsals ahead of the upcoming Victory Day Parade, in Moscow, on Thursday, May 6, 2010. Russians celebrate Victory in WWII on May 9. (AP Photo/Misha Japaridze)

Members of search teams which look for remains of Soviet soldiers killed during World War II, carry helmets and coffins during a funeral ceremony at a memorial cemetery in the village of Sinyavino, 50 km (31 miles) east of St. Petersburg, Russia, Thursday, May 6, 2010. The remains of 288 soldiers killed in heavy battles during World War II near Leningrad, now named St. Petersburg, in 1942-1944, were buried during a ceremony in Sinyavino before the Victory Day, celebrated in Russia on May 9. (AP Photo/Dmitry Lovetsky)

Members of search teams which look for remains of Soviet soldiers killed during World War II, carry helmets and coffins during a funeral ceremony at a memorial cemetery in the village of Sinyavino, 50 km (31 miles) east of St. Petersburg, Russia, Thursday, May 6, 2010. The remains of 288 soldiers killed in heavy battles during World War II near Leningrad, now named St. Petersburg, in 1942-1944, were buried during a ceremony in Sinyavino before the Victory Day, celebrated in Russia on May 9. (AP Photo/Dmitry Lovetsky)

Russian fighter jets and a transport plane fly over the Kremlin’s Ivan the Great Bell Tower during a rehearsal of the Victory Day Parade in Moscow, Russia, Tuesday, May 4, 2010. Troops from 13 countries have arrived in Moscow to prepare for the Victory Day Parade on May 9 to mark the 65th anniversary of the end of World War II. (AP Photo/Misha Japaridze)

Russian fighter jets and a transport plane fly over the Kremlin’s Ivan the Great Bell Tower during a rehearsal of the Victory Day Parade in Moscow, Russia, Tuesday, May 4, 2010. Troops from 13 countries have arrived in Moscow to prepare for the Victory Day Parade on May 9 to mark the 65th anniversary of the end of World War II. (AP Photo/Misha Japaridze)

Russian fighter jets fly over Kremlin cathedrals during a rehearsal of the Victory Day Parade in Moscow, Russia, Tuesday, May 4, 2010. Troops from 13 countries have arrived in Moscow to prepare for the Victory Day Parade on May 9 to mark the 65th anniversary of the end of World War II. (AP Photo/Misha Japaridze)

Russian fighter jets fly over Kremlin cathedrals during a rehearsal of the Victory Day Parade in Moscow, Russia, Tuesday, May 4, 2010. Troops from 13 countries have arrived in Moscow to prepare for the Victory Day Parade on May 9 to mark the 65th anniversary of the end of World War II. (AP Photo/Misha Japaridze)

In this May 1943 file photo, two German officers, left, and a group of Allied officers who were prisoners of war look over a partly-emptied mass grave in the Katyn Forest in Russia. Russia’s state archives posted documents Wednesday, April 28, 2010 for the first time on the Internet about the Soviet Union’s World War II massacre of more than 20,000 Polish officers and other prominent citizens. The step was a gesture to Poland in a case that looms large in Polish history and has soured relations between the two countries for decades. (AP Photo, File) Read more →

In this May 1943 file photo, two German officers, left, and a group of Allied officers who were prisoners of war look over a partly-emptied mass grave in the Katyn Forest in Russia. Russia’s state archives posted documents Wednesday, April 28, 2010 for the first time on the Internet about the Soviet Union’s World War II massacre of more than 20,000 Polish officers and other prominent citizens. The step was a gesture to Poland in a case that looms large in Polish history and has soured relations between the two countries for decades. (AP Photo, File)

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In this image made available in London Wednesday March 24, 2010 by the Ministry of Defence, a Russian Blackjack bomber is intercepted by a Royal Air Force Tornado F3 fighter near Stornoway, on the Isle of Lewis in the Outer Hebrides, on March 10, 2010. RAF jets have been scrambled 20 times in the last year to intercept Russian aircraft over British airspace, according to the Ministry of Defence. (AP Photo/Ministry of Defence)

In this image made available in London Wednesday March 24, 2010 by the Ministry of Defence, a Russian Blackjack bomber is intercepted by a Royal Air Force Tornado F3 fighter near Stornoway, on the Isle of Lewis in the Outer Hebrides, on March 10, 2010. RAF jets have been scrambled 20 times in the last year to intercept Russian aircraft over British airspace, according to the Ministry of Defence. (AP Photo/Ministry of Defence)