“Is Meraki smart enough to 'unmask' the VPN from Russia pretending to be from US?”. No.
Geoblocking is pretty basic and just blocks IP addresses well known to be assigned in Russia.
if you are honestly concerned about attacks from Russia you should probably have the FBI or DHS (assuming you are in the US) or some federal agencies involved. Otherwise, just carry on with current best practices for business network security.
- Ex community all-star (⌐⊙_⊙)