It was a clash with ominous Cold War overtones. Turkey's recent destruction of a Russian Su-24 jet was the first time in 63 years a NATO jet shot down a Russian one. Although Ankara claimed the jet was in Turkish territory, Russian President Vladimir Putin accused Turkey of a "stab in the back"and being "accomplices of terrorists."

Putin subsequently canceled Russian energy projects in Turkey, and also banned the import of Turkish fruit and vegetables. What Putin said next, though, should send chills down Turkish spines.

In comments during his annual state of the nation speech, Putin implied Russia might use force against Turkey: "We shall remind them many a time what they have done and they will more than once feel regret what they have done," said Putin. "Our armed forces, secret services and law enforcement agencies have been mobilized to give a rebuff to the terrorist threat."