On the front line: If Kharkiv falls, Ukraine falls

In the early days of the invasion, Kharkiv in eastern Ukraine fought back a Russian armored column.  Since then, it has suffered nightly Russian airstrikes and shelling, with dozens of civilians killed and hundreds injured.  The BBC’s Quentin Sommerville and cameraman Darren Conway have spent the week with the Ukrainian forces as they fight to stop a further Russian advance.

This report contains material some viewers will find disturbing