Only joint global action can end IS menace

After Turkey shot down a Russian fighter jet on Tuesday, observers are wondering the real reason behind the incident. While some analysts say it might be an accident, more tend to link it with Turkey's disputes with Russia.

It is too early to reach a definitive conclusion, but the two countries have been at loggerheads since Russia started its air strikes against Islamic State targets in Syria. Turkey wants Syrian President Bashar al-Assad to go. But by reportedly targeting the IS group and the rebel Syrian forces both, Russia, many believe, is protecting Assad.

And since Turkey has repeatedly alleged that Russia is violating its airspace and claims to have warned the Russian jet before shooting it down, one can say it is not an accident.