Russia has not taken a key position for months, despite intense efforts to achieve military gains. Wagner claims to have Russian mercenaries in control of a Soledar salt mine. But the regular Russian armed forces and Moscow defence ministry say the battle is still going on, hinting of a rift in pro-Russian forces. Ukraine also says there is still fighting there. Soledar’s deep salt mines could be used to position troops and equipment while being protected from Ukrainian missiles, and the tunnel network could be used to penetrate Ukrainian-controlled territory. The salt and gypsum mines provide sources of revenue for whoever works them. Wagner mercenaries have previously taken control of valuable African mining resources. Soledar’s battle is just one in a campaign that is not going well for Putin. If Russia seize Soledar the course of the war could change and Putin gain a propaganda win to present to his critics.