After four years leading his country in war, Volodymyr Zelenskyy is very frustrated. Russia may have been thwarted in its immediate bid to sweep aside the Ukrainian president and swallow its neighbor whole. But after months of U.S.-led negotiations, and as the conflict enters its fifth year on Tuesday, there has been little clear progress on key sticking points in peace talks. Now, Zelenskyy’s defiance of the Kremlin’s full-scale invasion has taken on an increasingly exasperated, if not desperate, tone. “I don’t need historical s--- to end this war and move to diplomacy,” Zelenskyy said in a post on X...