For the first time in over 40 years, China has launched a powerful intercontinental ballistic missile (ICBM) into the Pacific Ocean. This type of missile can travel thousands of miles, capable of reaching far-off countries, and the move has caught the world’s attention—especially the United States and its allies. Though China says it was just a training exercise, the implications are much larger and could signal the beginning of more frequent missile tests in open waters.

Why This Is a Big Deal

The last time China fired an ICBM into the Pacific was in 1980. Since then, most of its missile tests have happened on land, deep within the country's borders. While China has launched shorter-range missiles into the sea over the years, this open-ocean ICBM test is a bold move. It suggests that China is not only growing its nuclear arsenal but also becoming more confident in showing off its capabilities.

Transporter-erector-launchers for China’s DF-41, one of a number of ICBM types...