North Korea has fired off another missile in an apparent attempt to show force, and President Donald Trump took to Twitter to mock the country’s dictator.

“North Korea just launched another missile. Does this guy have anything better to do with his life?” Trump wrote Monday night in a two-part tweet.

“Hard to believe that South Korea and Japan will put up with this much longer. Perhaps China will put a heavy move on North Korea and end this nonsense once and for all!”

Earlier today, the communist country announced it had “test-launched its first intercontinental ballistic missile,” the AP reports.

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The launch appeared to be North Korea’s most successful missile test yet. A U.S. scientist examining the height and distance said the missile could potentially be powerful enough to reach Alaska.

In typically heated rhetoric, North Korea’s Academy of Defense Science said the test of an ICBM — the Hwasong-14 — marked the “final step” in creating a “confident and powerful nuclear state that can strike anywhere on Earth.”

It will be difficult to confirm many details about what happened. North Korea’s weapons program is perhaps the most closely held state secret in one of the world’s most suspicious nations. U.S., South Korean and Japanese officials earlier assessed that the North fired an intermediate-range missile into waters near Japan.

Japanese Chief Cabinet Secretary Yoshihide Suga declined to comment on whether Japan thinks it was an ICBM, and South Korea’s Defense Ministry said it was analyzing whether the North’s statement was accurate.

“US experts said the device could reach Alaska,” according to Yahoo.

China’s foreign ministry urged North Korea “to stop taking actions that violate United Nations Security Council resolutions.”

“We hope all relevant parties can exercise restraint, ease tensions on the peninsula as soon as possible, and bring the peninsular issue back to the correct track of peace talks and consultation,” ministry spokesman Geng Shuang said after the apparent launch.