There are examples of a fragmented coalition winning a war. There are also examples of losing a war. I believe you view is antiquated and not rooted in the present reality of the world. There will be no conventional war with the EU. The war is a cyber one and one of swaying public opinion and one of sowing the seeds of doubt and confusion. At least as I see things. I'm by no means an expert but what is happening in the UK with it leaving the EU (supposedly!) and in the U.S. makes it clear that at present Russia is winning by fracturing the West. It remains to be seen if the EU can come together and form a cohesive alliance or if it will be fractured further with more states seeking to leave the EU.