US president, holding nukes and saying things like "whole civilization will die tonight" is just state terrorism of the worst kind, ... so far, yes. It may become a war crime of genocide. Not sure why should I or anyone wait and see, before issuing sweeping comments about all of america, which made this possible, by working hard to building up the military capable of doing it and giving power to nutjob issuing the threats.

Be sure that this US threat is not just against Iran, it's a US threat aginst the entire world, and it will be taken as such by many, you war crime justifying tool.

Also pretty telling, that you're using intl. law to justify US attacks, instead of using it for what their purpose was,... which is to limit the ways in which states execute war. The same thing Israel was doing to justify murdering 20 000 children in Gaza, just constantly finding "loopholes" and using it retroactively to justify every single thing they did that someone contensted.