Russian forces on Tuesday pressed forward their weeks-long drive to encircle and capture the eastern Ukrainian city of Bakhmut where the commander of Ukraine's ground forces described the situation as "extremely tense." The Russian troops, including mercenary fighters from the Wagner Group, are trying to cut the Ukrainian defenders' supply lines to the city, scene of some of the war's bloodiest battles, and force them to surrender or withdraw. That would give Russia its first major prize in more than half a year and open the way to the capture of the last remaining urban centers in the Donetsk region,...