Unprovoked here means that this was not a response to an attack by Iran on Israel or the US. It was also done during negotiations, which I hope you realize is a cardinal sin in diplomacy.
As for Khamanei, at the end of the day, he was a head of state. There are international systems in place for punishing people in power across state boundaries, which were setup because otherwise our world devolves into assassination and war.
As for Khamanei, at the end of the day, he was a head of state. There are international systems in place for punishing people in power across state boundaries, which were setup because otherwise our world devolves into assassination and war.