Iran vows US will 'regret' sinking frigate IRIS Dena; Says was guest of India https://english.mathrubhumi.com/news/world/us-submarine-sinks-iranian-frigate-iris-dena-sri-lanka-indias-guest-2026-updates-bfdjw0p0?utm_source=dlvr.it&utm_medium=mastodon #Iran #USNavy #IndianNavy