They do

How? They're sanctioned

Payments to and from Russia are sanctioned, some banking/government services apps removed from the stores, but everything else works as before. And since Android allows 3rd party app stores, Russia has now its own app store where you can get everything what was banned due to sanctions.

Also as a software company you anyway don't want people massively using old versions of your product with publicly known security flaws. "New large YourProduct botnet noticed by security researchers" is never a good publicity in media even if botnet consists of sanctioned users' devices.