There was no mistaking the chilly vibes between US President Barack Obama and his Russian counterpart Vladimir Putin when they met on the sidelines of the UN General Assembly in New York on Monday. Stony-faced expressions said it all, whether they were dutifully posing for a handshake or clinking glasses during a toast at a UN luncheon. In speeches earlier on Monday, each blamed the other for the deteriorating situation in Syria while laying out divergent visions for global security.