President Donald Trump mentioned in a tweet on Sunday that Kim Jong Un had insulted him by naming him "old" and said he'd never call Kim "fat and short."
Trump remarked after attending the Asia-Pacific Economic Cooperation (APEC) summit in Vietnam.
In a succession of tweets, he also said Chinese President Xi Jinping had been "upping sanctions" on North Korea in response to its nuclear and missile programs which Xi wanted "denuclearize."
While Trump is visit to Beijing, last week Xi repeated that China would strive for the denuclearization of North Korea but offered no hint it would alter tack on North Korea, with which it fought side by side in the 1950-53 Korean war against U.S.-led forces.
One of Trump's tweets read: "Why could Kim Jong-un insult me by calling me 'old,' when I would NEVER call him 'short and fat?' Oh well, I try so difficultly to be his friend - and maybe someday that will happen!"
Speaking later in Vietnam's capital, Hanoi, Trump said "it'd be very, very pleasant" when he and Kim became buddies.
"This may be a strange thing to happen, but it's a chance," he said.
INSULTS AND THREATS
Amid escalating tension over Pyongyang's nuclear and missile programs as North Korea races toward its objective of creating a missile capable of reaching the United States, Trump has traded insults and threats with Kim -.
North Korea conducted its most demanding and most powerful nuclear bomb test on Sept. 3, prompting another round of U.N. sanctions.
In September Kim explained Trump as a "mentally deranged U.S. dotard" whom he would tame with passion. His comments came after Trump jeopardized in his maiden United Nations speech to "completely ruin" the country of 26 million people if the United States were threatened.
Trump tweeted in September: "Just heard Foreign Minister of North Korea talks at U.N. If he echoes ideas of Little Rocket Man, then they won't be around much longer!"
North Korea has conducted dozens of missile tests in defiance of all U.N. sanctions. It has pledged to never give up its weapons programs, saying they're necessary to counter from the United States and its allies.
The U.S. has said that all choices, such as military, are on the table, although its taste is to get a diplomatic option.
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