While the Wagner Group's public feud with Russia's military leaders could complicate Russia's war efforts in Ukraine, the military contractor will likely remain involved in the war, though its role will diminish over time. Yevgeny Prigozhin, the head of the Russian military contractor Wagner Group, has in recent days escalated his months-long feud with Russia's military leadership. On May 5, he accused Defense Minister Sergei Shoigu and General Staff Chief Valery Gerasimov, two close associates of Russian President Vladimir Putin, of causing the deaths of Wagner soldiers by failing to provide Wagner Group sufficient artillery ammunition. Then on May 10, Prigozhin suggested that an unnamed ''grandpa'' -- a possible reference to Putin -- was an imbecile whose withholding of resources was a catastrophic mistake. On May 11, reports in Russian media citing Kremlin officials suggested that the comments nearly crossed a red line of attacking Putin, but that Prigozhin's ability...