What Yevgeny Prigozhin’s presumed death means for Ukraine

What did Yevgeny Prigozhin do?
Russian mercenary boss Yevgeny Prigozhin challenged the Kremlin in a brief mutiny. Yevgeny Prigozhin made his name as the profane and brutal mercenary boss who in June mounted an armed rebellion that was the most severe and shocking challenge to Russian President Vladimir Putin's rule.