Seems like a good example of how multiple forces attempting to wage wars against different factions in the same space can lead to problems.
http://www.bbc.com/news/world-middle-east-34907983
Turkish warplanes have reportedly shot down a Russian military aircraft on the border with Syria.
Russia's Interfax news agency cited the Russian defence ministry as saying that a Su-24 had crashed in northern Syria, and that its two pilots had ejected.
Turkish military officials said Turkish F-16s shot down the plane after warning its pilots that they were violating Turkish airspace.
Video footage showed the plane crashing into mountains in Latakia province.
Russian launched an air campaign to bolster Syrian President Bashar al-Assad against rebels in late September.