Ukrainian troops pulled back from some territory in Bakhmut this week as Russia launched a “re-energized” assault on the Donetsk Oblast battlefield city, British intelligence said Friday. “Russia has re-energized its assault on the Donetsk Oblast town of Bakhmut as forces of the Russian [Ministry of Defense] and Wagner Group have improved cooperation,” the update read. “Ukrainian forces face significant resupply issues but have made orderly withdrawals from the positions they have been forced to concede,” it continued. “The Ukrainian defense still holds the western districts of the town but has been subjected to particularly intense Russian artillery fire over the previous 48 hours.” The Wagner Group, Russia’s primary, controversial mercenary force, has played a key role in the scramble for Bakhmut, which is one of the last urban centers in the region to resist Russian incursion. According to the UK’s Friday update, Wagner Group fighters are pursuing the city center, while paratroopers spearhead assaults on the outskirts. Bakhmut had a population of 70,000, but not the city is mostly ruble.