On Nov. 24, Turkey shot down a Russian warplane that it says had crossed into its airspace from Syria. Though Russia denies it had violated Turkish airspace, Turkey has been complaining of such Russian violations ever since Russia began its military intervention in Syria this September.
Vox: A Russia expert explains how Putin will likely respond to his downed plane
Russian Air Force Su-24 bombers (center) fly during a military exercise in southern Russia on Feb. 11, 2015.
