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For example, the Iraq war was not approved by the UN Security Council, which is the only forum that can approve the use of force between (UN member) countries, apart from self defence. See https://en.m.wikipedia.org/wiki/Legality_of_the_Iraq_War for more details.

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The UN doesn't have any legal authority and even if it did it wouldn't be able to enforce it without the US and it's allies.

Remember, international "law" doesn't exist. There is no legal/illegal. It's all governered by treaties and gentlemen's agreements between nation's.

International law definitely exists. In fact, Wikipedia has a whole long and interesting article about it: https://en.m.wikipedia.org/wiki/International_law

Another example: international law bans torture, enforceable under ”universal jurisdiction”. That might be one reason why Bush and Cheney haven’t been to Europe since their days in office.

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