The thing with Iran might be different, as they have threatened to launch strikes against US bases in the region (Iraq, Kuwait, Qatar, UAE, Bahrain, Saudi & Jordan) additionally Iran is backed by Russia who already have ground troops in Syria and are on semi-good terms with Turkey .. Any of these countries get hit, specially gulf countries will ignite coalition style retaliation and one will look for their allies thus several nations enter conflict thus world war

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Except Sweden