You must always be at declared war with your enemies? And why would it need to be "declared" - which is a subjective premise from nation to nation. Throughout r

You must always be at declared war with your enemies? And why would it need to be "declared" - which is a subjective premise from nation to nation. Throughout recorded history nations have fought proxy and covert wars against their perceived enemies with no declaration. Ask Iran if they're at war with the US (maybe kinda sorta). Then ask them if the US is an enemy (definitely). The same would go for Iran and Israel. There's no confusion there, you can clearly have enemies without a declared war. The instant prior to the declaration of war the other side wasn't an enemy? Logically it's not a sound concept.