Ukrainian soldiers firing a howitzer into the Russian-held town of Pisky in the Donetsk region. Photograph: Nicole Tung/The New York Times The battle for the eastern Ukrainian salt mining town of Soledar raged in sub-zero temperatures on Wednesday, as Russia’s mercenary Wagner Group claimed it had taken control. Kyiv said earlier its forces were holding out. The Ukrainian military's morning summary made one mention of Soledar, listing the town as one of several being shelled in the Donetsk region. Reuters was unable to verify conditions on the ground. Russian commanders have made the capture of Soledar a key objective in...