Answer : 1. "United States and Japan"
Explanation :

Japan and the US signed a contract worth more than $3 billion to develop interceptors for hypersonic missiles by 2030. The plan, announced in August, addresses the rapid advances in missile technology around Japan. Japan allocated ¥75 billion ($480 million) for development through 2024. The speed and irregular trajectories of hypersonic missiles make them difficult to intercept. Japan's defense budget has increased amid rising tensions with China and North Korea.