Philippine President Rodrigo Duterte salutes as he arrives at Manila's international airport, Philippines, Wednesday, May 24, 2017. Duterte warned Wednesday that he'll be harsh in enforcing martial law in his country's south as he abruptly left Moscow to deal with a crisis at home sparked by a Muslim extremist siege on a city, where militants burned buildings overnight and are feared to have taken hostages. (AP Photo/Aaron Favila)
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