No. Blowing up Suleimani with a predator drone was not an assassination. No. Blowing up Saleh al-Arouri with a drone was not an assassination.
Assassination requires a scheme or subterfuge. It's creeping up on someone or setting up for the perfect moment. An entire military department directing a distance strike at a convenient moment is not an assassination, it is an act of war.
Assassination is ALSO generally an act of war but the method and context is different.
It's when you dress up in all white and jump on a dude from thirty feet in the air and then stab him precisely in the neck, then having a philosophical discussion with them in a white room
Have to say requiescat in pace afterwards otherwise it's just murder
Leave it to the Italians to come up with a Pope-killing loophole