As forces opposed to Syrian President Bashar Assad make swift and significant advances in Syria, Turkey is watching closely for any spillover. Turkey, which shares a 911-kilometer- (566 mile-) long frontier with Syria, has been a main backer of opposition groups aiming to topple Assad since the outbreak of the Syrian civil war in 2011. The conflict led to a refugee influx and Turkey now hosts 3 million Syrians.
Where Turkey stands as opposition insurgents advance in neighboring Syria
