Ahead of the diplomatic blitz Serbian President Vucic is taking to the UN in New York City, US Assistant State Secretary James O’Brien swooped into Belgrade for a tête-à-tête on a Saturday morning at 9 AM. The conversation isolated two points of disagreements: Kosovo and the UN resolution on Srebrenica in what O’Brian otherwise has qualified as “good conversation” with President Aleksandar Vucic. Serbia finds itself between the rock and a hard place. On one flank, the European Council is ready to embrace Kosovo into its fold, while on the other, Germany is leading the charge in the United Nati…