Seems Turkey miscalculated presumption of NATO support ... and Russia's reaction - see below. Reuters: US believes Russian jet was hit inside Syrian airspace http://tass.ru/en/world/839009 Leaked Ankara UN letter claims Su-24's ‘air space violation’ lasted 17 seconds (Turkey: 17 second air space transit = must ... shoot ... down ... jet) https://www.rt.com/news/323343-turkey-un-syria-russian-plane/ Downed in 17 seconds: Where Turkey’s story of Su-24 violating airspace just does not add up https://www.rt.com/news/323369-turkey-downed-russian-jet/ Russia deploys missile cruiser off Syria coast, ordered to destroy any target posing danger https://www.rt.com/news/323329-russia-suspend-military-turkey/ Russian Air Force Annihilated Militants In Area Where Su-24 Was Shot Down. Erdogan Ordered Turkish Air Force Planes Be Grounded http://southfront.org/vks-russian-federation-has-annihilated-the-militants-i...