Russian President Vladimir Putin (left) greets Supreme Court Chairman Vyacheslav Lebedev. The Kremlin says Putin, who has been out of public view for more than a week, is perfectly healthy. Alexei Druzhinin/AP hide caption

itoggle caption Alexei Druzhinin/AP

Police escort the suspects in the killing of Boris Nemtsov into a court house in Moscow, Russia, on Sunday. A total of five people have been arrested over the weekend in connection with the killing of the fierce opponent of President Vladimir Putin. Ivan Sekretarev/AP hide caption

itoggle caption Ivan Sekretarev/AP

A portrait of Kremlin critic Boris Nemtsov and flowers photographed on Friday at the site where he was killed on February 27, with St. Basil's Cathedral seen in the background. Maxim Shemetov/Reuters/Landov hide caption

itoggle caption Maxim Shemetov/Reuters/Landov

Bill Browder crosses Red Square in 2004, at the height of Hermitage Capital Management's success. James Hill/Courtesy of the Browder Family Archives hide caption

itoggle caption James Hill/Courtesy of the Browder Family Archives

Swedish navy corvette HMS Visby patrols in the Stockholm Archipelago, Sweden, in October. The Swedish military was searching for evidence of suspected undersea activity in its waters amid reports of a Russian submarine intrusion. Marko Saavala/TT News Agency/AP hide caption

itoggle caption Marko Saavala/TT News Agency/AP

Written during the Soviet era, Mikhail Bulgakov's classic novel, The Master and Margarita, continues to resonate in today's Russia. Sovfoto/UIG via Getty Images hide caption

itoggle caption Sovfoto/UIG via Getty Images

Russian President Vladimir Putin, shown delivering his state of the union speech earlier this month, was riding high this year as the country hosted the Winter Olympics. Russia is now embroiled in economic turmoil, and Putin has alienated Western countries that could potentially help. Pavel Golovkin/AP hide caption

itoggle caption Pavel Golovkin/AP

Russian President Vladimir Putin, in his state of the union speech on Thursday, defended the Kremlin's aggressive foreign policy, saying the actions are necessary for his country's survival. Pavel Golovkin/AP hide caption

itoggle caption Pavel Golovkin/AP

Russia's President Vladimir Putin (right) helps put a shawl or coat on Peng Liyuan, wife of China's President Xi Jinping, as Xi talks to President Obama during a fireworks show celebrating the Asia-Pacific Economic Cooperation session in Beijing. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Former President George W. Bush (right) and his father, former President George H.W. Bush, wave as they leave a family wedding in Washington, D.C., in May 2006. Normand Blouin-Pool/Getty Images hide caption

itoggle caption Normand Blouin-Pool/Getty Images