WASHINGTON — The United States has provided intelligence that has helped Ukrainians target and kill many of the Russian generals who have died in action in the Ukraine war, according to senior American officials. Ukrainian officials said they have killed approximately 12 generals on the front lines, a number that has astonished military analysts. The targeting help is part of a classified effort by the Biden administration to provide real-time battlefield intelligence to Ukraine. That intelligence also includes anticipated Russian troop movements gleaned from recent American assessments of Moscow’s secret battle plan for the fighting in the Donbas region of...