New Delhi, March 7 -- The sinking of an "unarmed" Iranian warship by the US away from the combat zone cannot be allowed to pass "with impunity" and Iran has no option but to resist to the last soldier in an "existential war", Iranian deputy foreign minister Saeed Khatibzadeh said on Friday. "...That vessel was [here] on the invitation of our Indian friends. it was unarmed and the only precedent for that was during the Nazi times," he said on the margins of the Raisina Dialogue. P8...