Fierce fighting for control of the center of Bakhmut, in eastern Ukraine, has been raging for months, with both Russia and Ukraine claiming progress in the devastating battle. Russia's Wagner mercenary group has reportedly been leading Moscow's charge for the industrial city, and on Monday, Ukraine said that the group had been pushing forward in the city. "Wagner assault units are advancing from several directions, trying to break through our troops' defenses," said Ukrainian military spokesperson Andriy Lysenko. The battle for Bakhmut is the longest and bloodiest battle of Moscow's invasion, and both sides have suffered heavy casualties. The Ukrainian military said that at least two Ukrainian soldiers were killed and four were injured in the fighting on Monday. The battle for Bakhmut has been a major focus of the conflict between Russia and Ukraine, and the outcome of the fight is seen as a key indicator of the strength of both sides. The city is strategically important, and both sides are desperate to gain control of it. The international community has expressed deep concern over the situation in Bakhmut, and has called on both sides to end the fighting and find a peaceful resolution to the conflict.