Iran foreign minister says Ukraine's attack on Iranian vessel 'cannot go unanswered'

July 26 (Reuters) - Iranian Foreign Minister Abbas Araqchi said on Sunday a Ukrainian attack on an Iranian commercial vessel "cannot go unanswered". Iran said the attack in the Caspian Sea resulted in an explosion that killed one sailor and injured another. Araqchi made the comments in calls with EU foreign policy chief Kaja Kallas and Russian Foreign Minister Sergei Lavrov, Araqchi posted on X. Lavrov, in a statement posted on the Russian Foreign Ministry's website, offered condolences in…