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If Russia decided to withold gas / oil, can the EU attack, even if it could make up its mind? Well, it'd be illegal.
We're not talking about some theoretical international law we're talking about foreign aggression. Besides, if you can't enforce a law it really isn't a law. If an aggressor threatens the security of a country they need to know that there will be a cost. If, in the future, Europe is perceived as being weak and her allies apathetic, those with less than honorable intentions will take advantage of her.