Re: And the consequenques fo failing to act?
Your memory seems to not stretch all the way back to last week where Iran's most senior general was assassinated by drone which I think for most countries constitutes a declaration of war.
Attacking an embassy is, by definition, an attack on a nation's sovereignty and is in itself an act of war. Failing to respond to such an attack is an open act of weakness - it's saying that attacks on this country will not be punished.