My question to you is what more evidence can Iran get at this point that they have to consider threats from the US as real and that a preemptive strike under the UNs own rules a justifiable action? Even China and Russia can't deny this anymore. At this point any country or institution that says Iran is the problem will never attribute that the cause and initiator is the US and Israel. 

Religiously in Shia they are already in War because of last year and have a duty to finish this. So legally in the eyes of the people that matter "the global majority/south" and religiously " Shia Islam" they have the green light to attack. This is my perspective