"I am not expecting any big issue that he will raise up to the president of China", he said.
In 2015, while he was mayor of Davao City, Mr. Duterte said in an interview with Esquire that he had stabbed someone to death when he was 17 years old.
"At 16, I killed someone", he told Filipinos in the Vietnamese city of Da Nang, where he is attending a regional summit.
Mr Duterte made the assertion on Thursday in a meeting with the Filipino community in Da Nang, Vietnam, where he and leaders from other Pacific Rim countries were gathered for a meeting of the Asia-Pacific Economic Cooperation forum.
The relations have great prospects, he said, adding the meetings with them were fruitful.
Across town, protesters from the militant group Bagong Alyansang Makabayan (Bayan) rallied outside Trump Towers, claiming the United States president had the intention of using the Philippines' territory to install more American military bases and that his heightened involvement in the country's affairs could drag them into war.
Australia's spy chief, Nick Warner, was criticised when he returned home from Manila in August to find the Philippine government had released photos of him clenching his fist with Duterte.
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"We collected taxes. Billions of taxes [which] were unpaid for many years.So it's a good year", said Duterte. Airport officials said he arrived at 5:45 p.m.at the Ninoy Aquino International Airport. "I will slap her in front of you. Why?"
Duterte took steps to thaw frosty relations with China after he won the presidency previous year.
Mr Duterte has encouraged extrajudicial killings of those involved in the drugs trade, and said he would "be happy to slaughter" three million drug addicts in the country. "It was just over a look", Agence France Presse quoted him as saying.
"Foreign leaders should recognise that the fist. symbolises a purposeful attack by Duterte on rule of law that has inflicted a human rights calamity on thousands of Filipinos", Phelim Kine, Human Rights Watch deputy Asia director, told AFP.
But critics warn the gesture has come to represent the brutalities of Duterte's drug war, which has claimed thousands of lives.
Duterte said he sees a very bright future for the relationship between the Philippines and China. "He does not call me out over my campaign about human rights".
"Human rights, son of a b***h", he said at the time.