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World leaders, including US President Barack Obama (R) and Turkish President Recep Tayyip Erdogan (L) observe a minute of silence on November 15, 2015 in Antalya, to remember the victims of terror attacks in Paris and Ankara at the start of a two-day G20 summit in the Turkish resort of Antalya. AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

World leaders, including US President Barack Obama (R) and Turkish President Recep Tayyip Erdogan (L) observe a minute of silence on November 15, 2015 in Antalya, to remember the victims of terror attacks in Paris and Ankara at the start of a two-day G20 summit in the Turkish resort of Antalya. AFP PHOTO / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)