South Korea’s military said Sunday that North Korea fired several cruise missiles that flew over waters near a major military shipyard on the country’s eastern coast, extending a streak in weapons tests that are worsening tensions with the United States, South Korea and Japan.

The launches followed a separate round of North Korean cruise missile tests last week and a January 14 test-firing of the country’s first solid-fuel intermediate-range ballistic missile. Those tests reflect North Korean leader Kim Jong Un’s efforts to expand his arsenal of weapons designed to overwhelm missile defenses in South Korea and Japan and remote U.S. targets in the Pacific, including Guam.