Russia's Wagner mercenaries battle Ukrainian resistance in Soledar's town centre- Summary- Companies- Soledar, salt mines have symbolic, military and commercial value- Ukraine says troops still holding onto positionsKYIV/NEAR BAKHMUT, Ukraine, Jan 11 (Reuters) - The battle for Soledar raged in sub-zero temperatures on Wednesday, with Russia's mercenary Wagner Group claiming to have taken control of the salt mining town in eastern Ukraine, as its fighters poured fire on a pocket of resistance in the centre.But Ukraine's Defence Ministry tweeted late on Tuesday, "Even after suffering colossal losses, Russia is still maniacally trying to seize Soledar - home to the largest salt mine in Europe."RUSSIA SEEKS MAJOR WINUkraine's military said its forces had repelled enemy attacks in the areas of 13 settlements in Luhansk, Kharkiv and Donetsk regions, including Bakhmut.Moscow says capturing Bakhmut would be a major step toward taking full control of the Donetsk region, one of four provinces it claimed to have annexed three months ago."The decision of the U.S. defence department to organise a training course at Fort Sill in Oklahoma is yet another confirmation of Washington's de facto participation in the Ukrainian conflict on the side of Kyiv's Nazi criminals," Anatoly Antonov, Russia's ambassador to Washington, said in a statement posted by his embassy."