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ASTANA, KAZAKHSTAN - MAY 31, 2016: Armenia's President Serzh Sargsyan, Belarus' President Alexander Lukashenko, Kazakhstan's President Nursultan Nazarbayev, Russia's President Vladimir Putin and Kyrgyzstan's President Almazbek Atambayev (L-R seated) at a meeting of the Supreme Eurasian Economic Council at the Akorda Presidential Palace. Alexei Druzhinin/Russian Presidential Press and Information Office/TASS (Photo by Alexei Druzhinin\TASS via Getty Images)

ASTANA, KAZAKHSTAN - MAY 31, 2016: Armenia's President Serzh Sargsyan, Belarus' President Alexander Lukashenko, Kazakhstan's President Nursultan Nazarbayev, Russia's President Vladimir Putin and Kyrgyzstan's President Almazbek Atambayev (L-R seated) at a meeting of the Supreme Eurasian Economic Council at the Akorda Presidential Palace. Alexei Druzhinin/Russian Presidential Press and Information Office/TASS (Photo by Alexei Druzhinin\TASS via Getty Images)