Philippine President Rodrigo Duterte walks past honour guards as he arrives at Manila international airport in Manila on May 24, 2017, after returning from a visit to Russia.
Duterte threatened on May 24 to impose martial law nationwide to combat the rising threat of terrorism, after Islamist militants beheaded a policeman and took Catholic hostages while rampaging through a southern city. / AFP PHOTO / NOEL CELIS        (Photo credit should read NOEL CELIS/AFP/Getty Images)