US Military Action in Indian Ocean Disrupts Regional Stability and Trade A US submarine sank Iran's frigate IRIS Dena off Sri Lanka's coast, marking the first American submarine attack on a surface vessel since World War II. The incident occurred in Sri Lanka's exclusive economic zone, a critical shipping corridor in the Indian Ocean. Over 100 sailors remain missing or dead following the attack. Iran has vowed retaliation, with Foreign Minister Abbas Araghchi denouncing the action as an atrocity. The timing creates significant complications for India's Prime Minister Narendra Modi, as the Iranian vessel had just participated in an Indian-hosted naval exercise days prior. Strategic analysts warn the incident effectively transforms India's maritime neighborhood into an active conflict zone, raising questions about New Delhi's authority and control over regional waters.