Just 2 days ago Turkey downed a Russian jet.
Putin promised serious consequences and according to Yahoo this is happening right now:
Residents said on Thursday that Russian warplanes bombed a rebel-held Syrian town along the Turkish border a day after hitting a truck depot near a crossing between the two countries.
One resident said the air strikes hit a busy main square in the town of Saraqeb in Idlib province, where hundreds of vehicles brought in through the nearby Bab al Hawa border crossing were being sold.