When is it legal to go to war?

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Under international law, when can a country declare war on another? Was it legal for Israel and the United States to have carried out "pre-emptive" airstrikes across most of Iran’s provinces, which started the war? The USA says the attacks were justfied, because of an imminent threat from Iran's nuclear programme, and Israel claims it acted in self-defence. The Israeli President went further - telling the BBC that focusing on the legality of the war instead of regional security is "mind-boggling" to him. And what of Iran's response? Was it reasonable under international law? In the last few weeks, practically all its Gulf-state neighbours have been targeted, as well as its drones or…