Wagner chief Yevgeny Prigozhin -- once seen as a close ally and known as "Putin's chef" due to past Kremlin catering contracts rather than culinary prowess -- has moved into open revolt. Therefore, this whole story is also a blow to Putin's positions." He also took to launching brazen verbal attacks against the Russian defence ministry. In Putin's icy address on Saturday he pointedly did not refer to Prigozhin by name, a tactic he also uses concerning the jailed opposition figure Alexei Navalny. Prigozhin's conduct contrasts with that of the strongman of the southern Russian region of Chechnya, Ramzan Kadyrov, who also built up his own private militia force but has remained staunchly loyal to the Kremlin.