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Japan and the US move ahead in co-developing hypersonic weapons interceptor as regional threats grow

FILE - U.S. President Joe Biden, left, shakes hands with Japan's Prime Minister Fumio Kishida during a joint news conference with South Korean President Yoon Suk Yeol, not visible, on Aug. 18, 2023, at Camp David, the presidential retreat, near Thurmont, Md. Japan and the United States on Wednesday, May 15, 2024 signed an arrangement to jointly develop a new type of missile defense system as the allies seek to defend against the growing threat of hypersonic weapons, which are possessed by China and Russia and being tested by North Korea. (AP Photo/Andrew Harnik, File)

FILE - U.S. President Joe Biden, left, shakes hands with Japan鈥檚 Prime Minister Fumio Kishida during a joint news conference with South Korean President Yoon Suk Yeol, not visible, on Aug. 18, 2023, at Camp David, the presidential retreat, near Thurmont, Md. Japan and the United States on Wednesday, May 15, 2024 signed an arrangement to jointly develop a new type of missile defense system as the allies seek to defend against the growing threat of hypersonic weapons, which are possessed by China and Russia and being tested by North Korea. (AP Photo/Andrew Harnik, File)

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TOKYO (AP) 鈥 Japan and the United States on Wednesday signed an arrangement to jointly develop a new type of missile defense system as the allies seek to defend against the growing threat of hypersonic weapons, which are possessed by China and Russia and being tested by North Korea.

The project was initially agreed between Japan鈥檚 Prime Minister Fumio Kishida and U.S. President Joe Biden at their summit last August and reaffirmed between the leaders during Kishida鈥檚 April visit to Washington. The Glide Phase Interceptor is planned for deployment by the mid-2030s.

Wednesday鈥檚 agreement determines the allocation of responsibility and decision-making process, a first major step in the project, Japanese defense ministry officials said. They hope to decide on Japanese contractors and start the development process by March 2025.

Hypersonic weapons are designed to exceed Mach 5, or five times the speed of sound, posing a threat to regional missile-defense systems with their speed and maneuverability. Developing interceptors of them is a challenge.

Japan鈥檚 defense ministry called it a 鈥減ressing issue鈥 and noted that hypersonic weapons in the region have dramatically improved in recent years.

Under the arrangement, Japan is responsible for developing a part at the interceptor鈥檚 tip that separates in space to destroy the incoming warhead, as well as its rocket motors, officials said.

Japan has earmarked 75.7 billion yen ($490 million) for initial development and testing of the interceptor, according to the defense ministry.

The cost includes making components for the two companies, Raytheon Technologies and Northrop Grumman, that are developing the weapon in a competition led by the U.S. Missile Defense Agency. One will be chosen for the project.

The MDA has estimated the cost to develop the hypersonic missile interceptor will exceed $3 billion, including Japan鈥檚 share of $1 billion.

The interceptors will be deployed on Aegis-class destroyers, like the ship-to-air Standard Missile-3 that Japan previously co-developed with the United States.

Japan has been accelerating its miliary buildup as it stresses the need to fortify its deterrence against growing threats. Japan has also significantly eased its weapons export policy to allow co-developed lethal weapons to third countries.

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This story has been corrected to say GPI stands for Glide Phase Interceptor, not Glide Sphere Interceptor.

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