I don't think the US, Germany, and UK (1) expect further military conflict in Ukraine, or (2) desire to give any justification for conflict or escalation. There's plenty of money at stake for Western Europe, but Berlin, London, and Paris enjoy the advantage of not having direct borders with Moscow. Their security is not threatened so why escalate it? Germany and France been the firmest opponents to Ukrainian (and Georgian) membership in NATO for this very reason. Sanctions provide some minimal political leverage in the negotiations while also displaying resolve in the face of aggression without actually committing to a path of armed conflict.
Despite all the bluster, I think the Obama administration recognizes the futility of military force in this scenario. Neither the Black Sea or Baltic are ideal operating areas for US naval forces and the proximity to Russia significantly increases vulnerability to counter-attack. This would not signal to Moscow the same message it would send to the capital of a smaller power. Since the Russians already know that the US will not attack, such a gesture would be politically unhelpful and be quickly condemned and dismissed by Moscow as "escalation". Russia would respond in kind with maneuvers of its own, and call Washington's bluff since the Obama administration is not prepared to fight the Russians over Crimea. What then?
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