Idk if they actually manage to drive into any recognizable area of the Moscow metro area it will be a serious PR disaster, not just to westerners but to wealthy Muscovites who make up significant blocs of support and haven’t had to think about tangible violence. It’s a global city above the fray of war, and has a history of not being taken in advances, so I think the biggest thing is how uncertain anything could go depending how far they get.