US Submarine Sinks Iranian Warship IRIS Dena Near Sri Lanka, Escalating Regional Tensions

On March 3, a US submarine torpedoed and sank the Iranian frigate IRIS Dena in international waters near Sri Lanka, marking the first US submarine sinking of an enemy ship by torpedo since World War II. The vessel had recently participated in India's MILAN 2026 naval exercise. Approximately 180 crew members were aboard; Sri Lankan authorities rescued 30-32 sailors, while over 80 are reported dead. The strike escalates US-Israel military operations against Iran, prompting Iranian threats of wider regional conflict. The incident raises strategic concerns for India and regional maritime security.