World War III technical trials: in an interview with Sputnik News (a rather pro-government Russian site), the head of the Turkish Intelligence Department Hakki Pekin condemned the recent shooting down of the Russian Sukhoi24 bomber by the Turkish air force, calling it a "big mistake".
Pekin predicts big problems from now on, ed a very answer tough and well organized.
“Aside from the cancellation of official visits and probable sanctions economic, Russia is placing its Iskander missile systems in Kaliningrad. And it has very strong potential in this field."
Putin would be in possession of informations about sale of oil by ISIS through Turkish territory, and these would be the reasons for recent 'close' reconnaissance activities with respect to borders of Erdogan's country. For this reason, Russian Defense Minister Sergey Shoygu tweeted the decision to use the S-400 missile system, definitely one of the most fearsome in the world, at the air base near Latakia, close to the Syrian coast.

To give you an idea, this is the most advanced missile system in Russian possession, a system capable of hitting targets up to 250km within the Turkish borders, located just 50km from the border.
The shooting down of the Russian aircraft is considered by the Minister of Foreign Minister Lavrov a "premeditated provocation".
Everything suggests that the tension will not rise rapidly, but that it will rise massively and constantly.