By Vidya Bhushan Rawat* The reported sinking of the Iranian ship IRIS Dena in the Indian Ocean near Sri Lanka raises troubling questions about international norms and the credibility of the so-called rule-based order. If indeed the vessel was attacked by the American Navy while returning from a joint exercise in Visakhapatnam, it would represent a serious breach of trust and a violation of the principles that govern such cooperative engagements. Warships participating in these exercises are generally not armed for combat; they are meant to symbolize solidarity and friendship. The incident, therefore, is not only shocking but also deeply ironic.