Bakhmut: Russian casualties mount but tactics evolve

Ukraine has drawn a line in the dirt, and that line is Bakhmut. It is a city that few say matters strategically, but that tens of thousands have died fighting over. It began more than seven months ago, and is the longest battle of the war so far.

Two Ukrainian army brigades defending the city's southern flank gave the BBC access to their positions last week as fierce fighting continued in and around Bakhmut. The men have spent months facing both regular Russian army forces, and prisoners recruited by the Wagner private military group who have swarmed their trenches in droves. Troops say Russian casualties far outweigh theirs, but the enemy is deploying new techniques to try to seize the city and surrounding countryside.