‘Coalition of willing’ could bypass diplomacy

The 15-nation council has been split on Syria since 2011. Russia, president Bashar al-Assad’s ally, and China have vetoed three resolutions condemning Assad and calling for punitive steps against his government.
However, the US has previously intervened in conflicts without Security Council backing, most notably in the Kosovo War in 1999. Any strike by the US, Britain, France, and others without a clear UN mandate would infuriate Russia, which could be expected to denounce any such attack as illegal.