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MOSCOW, RUSSIA - MAY 07: Russian President Vladimir Putin (L) greets Cuban President Raul Castro (R) in the Kremlin May 7, 2015 in Moscow, Russia. Castro has arrived in Moscow to attend in the celebrations of the Victory Day and to watch a Red Square Military Parade honour the 70-th Anniversary of the Victory over Nazis. (Photo by Sasha Mordovets/Getty Images)

MOSCOW, RUSSIA - MAY 07: Russian President Vladimir Putin (L) greets Cuban President Raul Castro (R) in the Kremlin  May 7, 2015 in Moscow, Russia.  Castro has arrived in Moscow to attend in the celebrations of the Victory Day and to watch a Red Square Military Parade honour the 70-th Anniversary of the Victory over Nazis. (Photo by Sasha Mordovets/Getty Images)