This was a criminal act & highly reckless. It risks lethal retaliation & a new round of regional conflict.
Iranian leaders would be wise to wait for the return of responsible American leadership on the global stage & to resist the urge to respond against perceived culprits. https://twitter.com/AP/status/1332334130433036290

I do not know whether a foreign government authorized or carried out the the murder of Fakhrizadeh. Such an act of state-sponsored terrorism would be a flagrant violation of international law & encourage more governments to carry out lethal attacks against foreign officials.

These assassinations are far different than strikes against terrorist leaders & operatives of groups like al-Qaida & Islamic State, which are not sovereign states. As illegitimate combatants under international law, they can be targeted in order to stop deadly terrorist attacks.