South Korea

• North Korea conducted a test of what analysts believe is an intermediate-range ballistic missile on April 6, flying 800 kilometers over the Sea of Japan in a trajectory suggesting potential reach to US Pacific territories. • The test occurred during joint US-South Korean military exercises involving carrier strike groups and advanced fighter aircraft; North Korea condemned the drills as provocative and warned of stronger responses. • US Indo-Pacific Command characterized the test as destabilizing and reaffirmed security commitments to South Korea and Japan; military officials increased surveillance and readiness postures across the region.

• Presidents Biden and Yoon Suk Yeol signed a defense enhancement pact on April 4, 2026, in Washington, extending US nuclear umbrella to counter North Korea's 70+ missile tests in 2025. • Pact includes $12 billion in US precision munitions sales and joint AI-driven missile defense systems operational by 2028. • Agreement bolsters Indo-Pacific deterrence, with Yoon stating, 'This alliance is ironclad against Pyongyang's provocations.'

• Japan and South Korea formalized a expanded military cooperation agreement on Thursday, establishing joint command structures and coordinated response protocols to address escalating North Korean weapons development and missile tests. • The two nations agreed to share real-time intelligence on North Korean military activities and established a rapid-response task force designed to coordinate anti-missile defense systems within 48 hours of any provocation. • The agreement represents the strongest formal defense partnership between the two countries in over a decade and signals growing concern about North Korea's advancing intercontinental ballistic missile capabilities.