The new president has alarmed rights groups with his brash and foul mouthed rhetoric of killing but has maintained he will not become a dictator.
"I would like to invite you now to raise your glasses to the well-being of his Excellency and to the propriety and progress of the Filipino people".
Rodrigo Duterte was sworn in as the President on Thursday, after promising a ruthless and deeply controversial war on crime as the main focus of his six-year term.
"These sons of whores are destroying our children", Duterte said Thursday night to a crowd of 500 in a Manila slum.
"There are those who do not approve of my methods of fighting criminality, the sale and use of illegal drugs and corruption", he said.
Xi said in a congratulatory letter to Duterte that China and the Philippines are neighbors, and being friendly is a tradition of the two countries that has endured for more than 1,000 years.
"If a drug dealer resists arrest or refuses to be brought to a police station and threatens a citizen with a gun or a knife, "you can kill him", Duterte said in a nationally televised speech in early June".
During the campaign, Duterte said 100,000 people would die in his crackdown, with so many dead bodies dumped in Manila Bay that fish there would grow fat from feeding on them.
He has been accused of links to vigilante death squads in Davao, which rights groups say have killed more than 1,000 people.
Aquino also launched the legal action with the UN-backed tribunal in The Hague, arguing that China's claims to most of the strategically vital and resource-rich sea were in violation of worldwide law.
While Ramos did not categorically said he was endorsing Duterte, the former President's sister former senator Leticia Ramos-Shahani endorsed other presidential aspirant Senator Grace Poe.
Duterte in his inaugural speech said that his administration is "committed to implement all signed peace agreements, in step with constitutional and legal reforms."He also said that he looks forward to the participation of the indigenous peoples in the peace process to "ensure inclusivity".
"It's a cliffhanger so we should decide right", Duterte said. Duterte has even reportedly said that he might seek joint exploration in the South China Sea, a principle China has always been advocating.
Duterte, who won by a landslide in the May elections with 16.6 million votes, is the Philippines' first president from Mindanao.
"I order all secretaries and heads of agencies to remove redundant requirements, and compliance with one department or agency shall be accepted as sufficient for all", Duterte said.
Yet as many observers have noted, Duterte is also seeking USA support on the South China Sea issue among others and help in building the island country's regional clout.
"F*** you United Nations, you can't even solve the Middle East carnage. couldn't even lift a finger in Africa (with the) butchering (of) the black people". "Shoot him and I'll give you a medal".