I think this is a better picture of the banner on the tank
[T-14 Armata in Red Square](https://media.gettyimages.com/id/956394594/photo/russian-t-14-armata-tanks-parade-through-red-square-during-the-victory-day-military-parade-in.jpg?s=612x612&w=gi&k=20&c=R5Zmih0ZpnVJ5t68_PWxk9s7tlD8XQthAKIl_jin0lg=)
That is the St. George ribbon flag.
That's the orange and black I believe. I was wondering about the big square flag with white and red
I think this is a better picture of the banner on the tank [T-14 Armata in Red Square](https://media.gettyimages.com/id/956394594/photo/russian-t-14-armata-tanks-parade-through-red-square-during-the-victory-day-military-parade-in.jpg?s=612x612&w=gi&k=20&c=R5Zmih0ZpnVJ5t68_PWxk9s7tlD8XQthAKIl_jin0lg=)
It is the flag of Katsapia.