Sri Lanka's newly appointed Prime Minister Mahinda Rajapaksa (3rd R) hands a signed document to his secretary Sirisena Amarasekara (L) during a ceremony to assume duties at the prime minister's office in Colombo on October 29, 2018. - Ousted prime minister Ranil Wickremesinghe said October 29 that his controversial sacking has left Sri Lanka in a power vacuum and demanded that parliament be allowed to end a standoff with the president. (Photo by ISHARA S. KODIKARA / AFP)        (Photo credit should read ISHARA S. KODIKARA/AFP/Getty Images)