The downing of a Russian jet by Turkish warplanes earlier this week marked one of the most high-profile incidents between Russia and a Nato member for decades. Ankara accuses Moscow of violating Turkish airspace, but the Russian defence ministry insists its plane was flying over Syrian territory when it was shot down. Airspace violations have become increasingly common in recent years with the majority of encounters proving peaceful and routine, something that may change in light of events on Tuesday.

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