a) First, as a general disclaimer, we don't yet know all the facts;
b) But it is clear that Soleimani has been responsible for orchestrating acts against US forces;
Thus, there are strong arguments the US strike was legal . . .
b) It could be argued that Quds force actions have constituted an ongoing armed attack against the US, thus an armed attack has occurred OR . . .
d) customary international law recognizes a right of
anticipatory self-defense, if an attack is i) imminent and ii) the response is proportionate to the threat . . .
BUT . . . . .