Some big ripples from this; hopefully cool heads will prevail but they haven't so far. Even if the Sukhoi did briefly enter Turkish airspace as the Turks claim, their own violation in shooting it down in Syrian airspace was much more flagrant. Does this drag us in, Turkey being a NATO member?Perhaps it's time for a serious think on the implications of an expanded NATO. It was our bastion during the dark cold-war years. Is there a danger now that membership will encourage members on the periphery to a more rash action than they would otherwise?