As fighters were advancing, Prigozhin was reportedly at the Russian army's Southern Military District headquarters meeting high-ranking military officials.

Source: https://www.express.co.uk/news/world/1794141/Wagner-fighter-breaks-silence-as-he-opens-up-about-Russian-mutiny

By that time, Russia will probably have rebuilt and reinforced its capabilities in the Western Military District.

Source: https://lithuaniatribune.com/intelligence-is-worried-there-will-be-no-more-silence-around-lithuania/

Mr. Prigozhin leaving the headquarters of the Southern Military District as Wagner forces pulled out of Rostov-on-Don, Russia, in June.

Source: https://www.nytimes.com/2023/08/25/world/europe/yevgeny-prigozhin-dead.html

The guy on the upper right of top image is commander of the Western Military District General Yevgeny Nikiforov.

Source: https://japantoday.com/category/world/russian-black-sea-commander-shown-on-video-call-after-ukraine-said-it-killed-him

The Kremlin said that Mr. Putin listened to reports from Valery Gerasimov, the commander in charge of Moscow’s operations in Ukraine, and other top military brass at the headquarters of Russia’s Southern Military District.

Source: https://www.thehindu.com/news/international/zelensky-visits-nato-candidate-sweden-for-1st-time-since-full-scale-war-with-russia/article67212731.ece

Wagner units were able to seize Rostov-on-Don, a city of over a million inhabitants and home to the command of the Russian army's Southern Military District, without a single shot being fired in anger.

Source: https://www.express.co.uk/news/world/1786732/russia-army-officers-abandon-putin-ukraine