俄土冲突

1. The motive for the strike was directly related to the Turkish role in supporting the anti-Assad forces in the vicinity of the border. In fact the Erdogan government made no effort to hide its aim in the days before the strike. In a meeting with the Russian ambassador on 20 November, the foreign minister accused the Russians of “intensive bombing” of “civilian Turkmen villages” and said there might be “serious consequences” unless the Russians ended their operations immediately.
   The Turkish shoot-down was thus in essence an effort to dissuade the Russians from continuing their operations in the area against al-Nusra Front and its allies, using not one but two distinct pretexts: on one hand a very dubious charge of a Russian border penetration for NATO allies, and on the other, a charge of bombing Turkmen civilians for the Turkish domestic audience[Gareth Porter(2015 Nov. 30) ].
3. Russian President Vladimir Putin has accused Ankara of shooting down a Russian warplane to protect supplies of oil from the Islamic State of Iraq and the Levant (ISIL) group to Turkey.
   On the sidelines of a global climate change conference near Paris on Monday, Putin said the downing of the plane was a "huge mistake".
   "We have every reason to think that the decision to shoot down our plane was dictated by the desire to protect the oil supply lines to Turkish territory," the Russian president said.
   "We have received additional information which unfortunately confirms that this oil, produced in areas controlled by [ISIL] and other terrorist organisations, is transported on an industrial scale to Turkey."

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Reference:

1. Gareth Porter(2015 Nov. 30). The Real Reason for Turkey's Shoot-Down of the Russian Jet. Retrieved on 2015 Dec 12 from website:
   http://www.commondreams.org/views/2015/11/30/real-reason-turkeys-shoot-down-russian-jet
2. WAR & CONFLICT(2015 Dec 1). Putin: Turkey shot down jet to protect ISIL oil supply. Retrieved on 2015 Dec 13 from website:
   http://www.aljazeera.com/news/2015/11/putin-turkey-shot-jet-protect-isil-oil-supply-151130191513006.html