By Dmitriy Khavin, Sarah Kerr, Riley Mellen and Muyi Xiao from NYT World
m sorry, but I couldn't find any information regarding a "Wagner Chief Prigozhin" appearing in videos at a Russian military headquarters. It's possible that the information you have might be inaccurate or based on unverified sources.
However, I can provide you with some general information about the Wagner Group and Yevgeny Prigozhin, who is associated with the group:
The Wagner Group is a private military company (PMC) believed to be based in Russia. It has been involved in various conflicts, including the Syrian Civil War and the conflict in Ukraine. The Wagner Group has gained attention for its alleged connections to the Russian government and its involvement in destabilizing activities in different regions.
Yevgeny Prigozhin is a Russian businessman often linked to the Wagner Group. He has been referred to as "Putin's chef" due to his catering businesses that have served Russian government events. Prigozhin has faced international sanctions for his alleged involvement in activities aimed at undermining other nations' governments and interfering in foreign elections.
Please note that my knowledge cutoff is in September 2021, and there might have been developments or new information regarding these topics since then. It's always advisable to refer to reliable news sources or investigative reports for the most up-to-date and accurate information.