US President Donald Trump has taunted North Korean leader Kim Jong-un on Twitter, nicknaming him after an Elton John song.
It was part of a series of Tweets in which he also took aim at his former rival, Hillary Clinton.
According to the White House, Mr Trump and his South Korean counterpart vowed to put more pressure on North Korea following recent nuclear and missile tests.
But in a series of early morning tweets, the US President took a more casual approach.
"I spoke with President Moon of South Korea last night. Asked him how Rocket Man is doing. Long gas lines forming in North Korea - too bad."
US Ambassador to the UN Nikki Haley said: "If the United States has to defend itself or defend its allies in any way, North Korea will be destroyed. We are trying every other possibility that we have."
The US President arrived in New York, where this week he'll address the UN General Assembly for the first time. North Korea will be at the top of the agenda.
Mr Trump's Secretary of State, Rex Tillerson, said it was up to Pyongyang to avoid a military response.
"All they need to do to let us know they're ready to talk is to just stop these tests, stop these provocative actions," Mr Tillerson said.
"If our diplomatic efforts fail though our military option will be in the only one left."
It's a big week for the US President and hard work beckons, but so does Twitter.
The temptation to share a doctored video that showed him hitting Ms Clinton with a golf ball proved too hard to resist. The tweet sparked more than 20,000 replies, many of them outraged, but many others accusing critics of not having a sense of humour.
The White House issued no comment, but in the past Mr Trump's aides have said his tweets "speak for themselves".