The U.S. and South Korea held a joint missile test on Wednesday. It was meant to be a show of force after North Korea tested an intercontinental ballistic missile, called the “Hwasong-14,” which experts say may have the ability to reach as far as Alaska.

In a statement, American and South Korean officials said that self-restraint was the only thing keeping them from attacking.

Pyongyang’s nuclear campaign is a direct violation of United Nations sanctions. The U.N. Security Council is meeting Wednesday to discuss the situation.