It was -3 degrees in Munich over the weekend and, inside the 51st Security Conference, there was an unmistakable cold war chill.  For three days the Bayerischer Hof hotel was a security and diplomatic lockdown as western leaders clashed with Russian counterparts over the way into – and out of – the Ukraine crisis. Delegates arrived in glum agreement over the risks posed by the conflict, and departed after heated disagreements over whether military might or diplomatic skill could save the day.