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The three nations threatened by North Korea’s nuclear missile program united for a show of force Sunday aimed at reminding Kim Jong-un’s regime that they have dominant air power in the Korean skies.

The United States sent four fighters and two bombers to fly alongside four South Korean fighters over the region near the demilitarized zone that separates the two Koreas. The U.S. aircraft also joined four Japanese fighters to fly over the waters near Kyushu, a Japanese island in close proximity to the Korean Peninsula.

The American planes included two B-1B Lancer bombers from Andersen Air Force Base on Guam, and four Marine Corps F-35B fighters from the Marine Corps Air Station in Iwakuni, Japan, according to U.S. Pacific Command.

It is the second time in the past month that B-1Bs and F-35s have been sent over the Korean Peninsula.

The Pacific Command said the jets, which conducted live-fire exercises, were sent up in response to the Sept. 14 launch of a North Korean missile. The missile flew over the northern Japanese island of Hokkaido.

The military exercise came as U.N. Ambassador Nikki Haley reminded the word that the United States is getting tired of talking about a resolution to the North Korean crisis.

“If North Korea keeps on with this reckless behavior, if the United States has to defend itself or defend its allies in any way, North Korea will be destroyed,” Haley said. “And we all know that, and none of us want that.”

Haley said the U.S. has been doing everything it can to find a diplomatic solution for the crisis, while leaving military action as a possible last resort.

“We wanted to be responsible and go through all diplomatic means to get their attention first. If that doesn’t work, General Mattis will take care of it,” she said, referencing Secretary of Defense James Mattis.

National security adviser H.R. McMaster said time has all but run out.

“This regime is so close now to threatening the United States and others with a nuclear weapon, that we really have to move with a great sense of urgency on sanctions, on diplomacy and preparing, if necessary, a military option,” McMaster told Fox News Sunday.