If Biden gets reelected you will see his new admin too. Xi was reelected last October, he changed his primer minister, defense minister, foreign minister, head of central bank...a lot. It's politics 101, even common sense. But in US propaganda made it a big deal. Pathetic.
Shoigu served 12 years, too long. It's well and long expected that Shoigu would be gone. All Russian pitical observers knew it. Obviously you're not one of them. But strangly you talked about Russia a lot. Just repeat same words again and again. LOL.
Mayebe western observers are surprised at the replacement, an economist. Its not the one they expected. Shoigu is a technocrat, a civilian too. In recent revival of Russian military industrial complex he together with Medvedev made the most important contribution.