One thing that most (all?) contemporary Russian tanks have is autoloaders, and as a result, their ammunition is stored in a carousel either in the turret or right below. This makes them hideously vulnerable to having the ammo go up on a penetrating hit, and is a big part of why so many Russian tanks exhibit the “jack-in-the-box effect” when hit (the turret blows up in the air as its ammo explodes).
Meanwhile most Western tanks still have a dedicated crewman who loads the main gun, and also store the ammunition in a protected part of the turret with specific blow-out panels on top. That way, if the ammo is hit, and the blast door isn’t open, it can blow up/cook off/catch fire and any blast/fire will be channeled up and out of the tank via the blow-off panels.
Here’s a test showing what I’m talking about:
M1A1 & M1A2 tank blow out panels on ammunition stowage - YouTube
You can see the operation of the blast door in this shot of a Dutch Leopard 2 loader (who seems pretty old, IMO):
