North Korea’s government has warned the United States against shooting down any of its missile tests. Kim Yo-jong, the sister of North Korean leader Kim Jong-un, said any such interception would be viewed as a “declaration of war.” Her warning came a day after the U.S. flew a nuclear-capable B-52 bomber over the Korean Peninsula in a joint drill with South Korean warplanes.

Meanwhile, Japan’s space agency failed in its debut attempt to launch its new H3 rocket to orbit on Tuesday after the vehicle’s second-stage engine failed to ignite. The malfunction destroyed a land observation satellite that was designed to help detect North Korean ballistic missile launches.