(CBS) -- As North Korea's most advanced missile launched into the night sky, a beaming Kim Jong-un was clearly pleased with his regime's accomplishment.
The Hwasong-15 rocket is the third ICBM launched by North Korea in the past 6 months.
"The dictator of North Korea made a choice yesterday that brings the world closer to war not farther from it," said U.S. ambassador to the United Nations, Nikki Haley.
At an emergency meeting of the United Nations Security Council, Haley issued a stark warning about what she calls North Korea's "continued acts of aggression".
"If war comes, make no mistake, the North Korean regime will be utterly destroyed," she said.
The Trump administration is calling on China, North Korea's main trading partner, to entirely cut off the regime's oil supply.
President Trump made fun of Kim Jong-un during a speech outside St. Louis on tax reform.
"He's a sick puppy," Trump said.
But experts who have studied photos of the regimes new weapon are taking it very seriously.
"I think it's clear from the pictures that it's a more capable rocket than, certainly than the last one we saw them launch," said David Wright of the Union of Concerned Scientists.
Wright says he's surprised by how fast North Korea is advancing its missile program.
"I'm less skeptical than I might have been that they can deliver a warhead to certainly the west coast and maybe larger parts of the united states, so I think the threat that they have been talking about is a real threat at this point," he says.
After this latest missile launch, North Korea declared that it has completed its nuclear weapons program.
State media reports that Kim Jong-un said it was such an important milestone, it should be recorded in the history of the country.