The United States will boost sanctions against Wagner following North Korea's sale of infantry rockets and missiles to the group last month, in violation of UN Security Council resolutions, said White House national security spokesman John Kirby.Close to PutinThe Wagner group is controlled by Yevgeny Prigozhin, a businessman once called "Putin's chef" for his work catering dinners for the powerful leader before and after he became the Russian president.A vocal critic of the Russian defense establishment's handling of the war in Ukraine, Prigozhin, 61, runs a number of diverse businesses out of his Concord Catering group in St. Petersburg.Convict recruits sent to frontPrigozhin himself reportedly dubbed the intense fight in Bakhmut a "meat grinder," saying it would destroy the Ukraine army.But Wagner itself has taken significant casualties, and Prigozhin has relied on prisons to supply Wagner with convicts to fill out its ranks."