Russian warplanes have been conducting airstrikes over Syria since late September, sometimes causing tension with Turkey when its planes come too close to the Turkish border.
These tensions finally came to a head on Tuesday, when a Russian warplane allegedly violated Turkish airspace and was shot down by Turkish F-16s.
It was an escalation of the conflict that was "not entirely unexpected," said Jonathan Schanzer, vice president of the Washington, DC-based think tank Foundation for Defense of Democracies.






