The long-awaited counteroffensive in Ukraine has begun. 

In what could be a pivotal moment in the almost 16-month-old war, Ukrainian forces are battling to retake cities occupied by Russia. 

Today, a former US State Department security advisor on what the frontline looks like, and what the renewed fighting could mean for the future of the war. 

Featured: 

Max Bergmann, Director, Europe, Russia, Eurasia program, Center for Strategic and International Studies, Washington DC