Ukrainian President Volodymyr Zelensky on Tuesday made an unexpected visit to troops defending Bakhmut, currently the site of some of the bloodiest fighting in the war, as his forces try to hold off a desperate Russian assault on the city in the eastern Donetsk region. Zelensky’s trip, which was confirmed by his office on his Facebook page, highlighted the carnage in Bakhmut, where Russian forces, including mercenaries, have been pushing for months to claim a battlefield victory after a string of defeats and retreats in the south and east of Ukraine. It was not immediately clear where in Bakhmut the...