The United States and South Korea “conducted a combined” ballistic missile drill in response to North Korea’s “destabilizing and unlawful actions on July 4,” CBS News reports.

The U.S. ARMY and military personnel from the Republic of South Korea deployed the Army Tactical Missile System and the Hynmoo Missile II, landing missiles in South Korea waters.

In a statement, the nations said “the ROK-U.S. Alliance remains committed to peace and prosperity on the Korean Peninsula and throughout the Asia-Pacific. The U.S. commitment to the defense of the ROK in the face of threats is ironclad.”

On Tuesday, Ambassador to the United Nations Nikki Haley called for an emergency meeting of the UN Security Council over the North Korean missile launch.