US President Donald Trump has offered Asia his services as a mediator, shortly after tweeting insults.
At the start of a meeting in Hanoi with the Vietnamese president, Mr Trump said he could help arbitrate the regional South China Sea dispute, which includes Vietnam and China.
"I'm a very good mediator and arbitrator," he said.
It came shortly after he called North Korea's Kim Jong-un "short and fat" on Twitter.
China, Vietnam, the Philippines, Taiwan, Malaysia and Brunei all have competing claims to territory in the South China Sea.
"If I can help mediate or arbitrate, please let me know," Mr Trump told his Vietnamese counterpart, Tran Dai Quang.
Ahead of the Hanoi meeting, Mr Trump president had fired of a series of angry tweets about his war of words with Kim Jong-un and his relationship with Russian leader Vladimir Putin.
On Saturday, North Korea denounced Mr Trump's Asia trip, calling it a "warmonger's visit" and again calling the president a "dotard" - a centuries-old insult for an elderly person.
Mr Trump responded by suggesting in a tweet that Mr Kim was "short and fat", and complaining: "Oh well, I try so hard to be his friend - and maybe someday that will happen!"
She said she was protesting against Donald Trump's attitude to women and his failure to meet with human rights activists in Vietnam.
Mr Trump will travel to Manila later on Sunday for the final stop on his Asia tour, before flying back to the US.