Crimea bombing claims life of Ukrainian submarine commander who defected

A bombing in Sevastopol, Crimea killed a former Ukrainian submarine commander described as a defector; authorities said a Russian national woman was arrested over the assassination. The day also saw a drone strike on a Ukrainian passenger train that killed two, damage and shutdown of a Russian refinery near Orsk due to sanctions, and reports of a foiled plot to kill a Ukrainian American in Warsaw, as Kyiv and Moscow exchange blows while discussing a Black Sea grain corridor.