SEOUL, South Korea (AP) — North Korea on Tuesday conducted its longest-ever weapons test, a nuclear-capable ballistic missile that flew over Japan and could reach the U.S. Pacific territory of Guam and beyond, forcing the Japanese government to issue evacuation alerts and halt trains.

The South Korean and U.S. militaries responded by launching fighter jets which fired weapons at a target off South Korea’s west coast in a show of strength against North Korea.

The North Korean missile launch was its most provocative weapons demonstration this year, as it pushes to develop a fully fledged nuclear arsenal capable of threatening the U.S. mainland and its allies with the goal of wresting concessions from those countries, some experts say.

North Korea has test-fired about 40 missiles over about 20 different launch events this year as its leader, Kim Jong Un, refuses to return to nuclear diplomacy with the United States.

The United States strongly condemned North Korea’s “dangerous and reckless decision” to launch what it described as a “long-range ballistic missile” over Japan.

“The United States will continue its efforts to limit (North Korea’s) ability to advance its prohibited ballistic missile and weapons of mass destruction programs, including with allies and U.N. partners,” National Security Council spokesperson Adrienne Watson said in a statement.