KYIV — For two months, Ukraine has been signaling its intent to recapture the southern city of Kherson in what has been billed as a major counteroffensive and the moment that Kyiv turns the tide against Russia.What that push will look like is still a mystery, however. Ukrainian artillery and rockets provided by the U.S. and allies have smashed bridges and Russian ammunition depots close to the city, but the larger movement of infantry has yet to happen. Meanwhile, the Russians are reinforcing and digging in.Ukrainian officials have long said the fate of the war could be decided in the...