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ST PETERSBURG, RUSSIA - DECEMBER, 26: (RUSSIA OUT) President of Armenia Serge Sargsyan, Kazakh President Nursultan Nazarbayev, Russian President Vladimir Putin, Kyrgyz President Almazbek Atambayev, and Eurasian Econimic Commission Chairman Tigran Sarkisyan (L-R) pose for a group photo during the Eurasian Economic Union Summit on December, 26, 2016 in Saint Petersburg, Russia. Vladimir Putin has ordered an investigation after a Russian military Tupolev TU 154 plane carrying 92 people, including the famous Alexandrov Red Army Choir, crashed into the Black Sea on his way to Syria after taking off Sochi on Sunday. (Photo by Mikhail Svetlov/Getty Images)

ST PETERSBURG, RUSSIA - DECEMBER, 26:  (RUSSIA OUT) President of Armenia Serge Sargsyan, Kazakh President Nursultan Nazarbayev, Russian President Vladimir Putin, Kyrgyz President Almazbek Atambayev, and Eurasian Econimic Commission Chairman Tigran Sarkisyan  (L-R) pose for a group photo during the Eurasian Economic Union Summit on December, 26, 2016 in Saint Petersburg, Russia. Vladimir Putin has ordered an investigation after a Russian military Tupolev TU 154 plane carrying 92 people, including the famous Alexandrov Red Army Choir, crashed into the Black Sea on his way to Syria after taking off Sochi on Sunday.  (Photo by Mikhail Svetlov/Getty Images)