The South Korean military on Friday conducted strike drills attacking a mock North Korean missile launcher with aerial laser-guided bombs, in response to North Korea’s launch of an intercontinental ballistic missile toward the East Sea.

The live-fire drills were staged at Pilsung Range in Kangwon Province in the afternoon, about six hours after the North Korean missile was launched to waters off Japan at 10:15 a.m., according to the Joint Chiefs of Staff.

The drills aimed to “demonstrate the ability of (South Korea’s) F-35 fighter jets with advanced stealth capabilities, to stealthily approach a target without being detected by the enemy and precisely strike the target,” the JCS said.

The South Korean Air Force’s four F-35A stealth fighters also flew with four F-16 Fighting Falcons of the US Air Force in a combined strike group over the East Sea.

The allies’ military actions came after South Korean President Yoon Suk-yeol instructed officials to strengthen the South Korea-US combined defense posture.

The missile, reportedly to be a new Hwasong-17 ICBM, traveled about 1,000 kilometers, reaching a top speed of Mach 22 and an altitude of around 6,100 kilometers. Japan said the ICBM would have a range exceeding 15,000 kilometers if fired at a regular trajectory, far enough to reach the US mainland.