“I will not speculate on the motives … but this does not look like an accident, and we have seen two of them,” Stoltenberg said of the air incursions over Turkey’s border with Syria. He noted that they “lasted for a long time”.

The incidents, which NATO has described as “extremely dangerous” and “unacceptable”, underscore the risks of a further escalation of the Syrian civil war, as Russian and US warplanes fly combat missions over the same country for the first time since World War II.

http://www.aljazeera.com/news/2015/10/nato-rejects-russian-explanation-turkey-incursion-151006130012896.html