A refugee crisis in northern Iraq’s Kurdish region is intensifying as winter approaches and the threat posed by ISIS forces shows no signs of abating, says journalist Jane Arraf.

Russia’s moves to mobilize thousands more troops and to annex more of Ukraine’s territory signal a new, potentially more dangerous phase of the war.

As twin explosions in Volgograd raise concerns of terrorist attacks disrupting Russia’s Winter Olympics in February, expert Dmitri Trenin explains the root causes of insurgency in the North Caucasus.