Yevgeny Prigozhin, the founder of Russia's mercenary group Wagner, accused unspecified officials of deliberately denying his fighters sufficient ammunition as part of an ongoing rivalry between himself and parts of the Russian elite. A onetime catering entrepreneur who once shunned the public spotlight, Prigozhin has assumed an ever more public role in Russian politics since the start of the war in Ukraine a year ago, with his Wagner Group spearheading Russia's months-long battle for the town of Bakhmut in Ukraine's Donetsk region. In a seven-minute long audio message published on Monday by his press service, an apparently angry and emotional...