Cal . If a USA citizen tries to open an account at Sber and / or
Raiff, they will want to see a social security card. So I gave good information.
from where? personal experience? for Sber It makes no sense. For Raiffeisen probably because they operate still in Russia under constraints, ie. there are allowed by USA to do so.
It is known that in the case of USA income tax is not tied to residency in the country but to citizenship and that USA did blackmail a diversity of countries in order to force their banking system to check citizenship of customers and list the ones who are USA.
Cal both Russia and USA share a common interest (even though there are sanctions) in that they both want to tax a person if they can.
Russia doesn't tax citizens who reside abroad if they don't run a business in Russia. It does tax benefits made abroad by residents in Russia, which is different.
Cal " there are regulations in place (in Russia) even today, to allow banks in different countries to share Tax Information.
"different countries": make it "one country". As I mentioned, years ago USA threatened a range of countries with financial sanctions if they didn't provide to US Treasury names of their residents of USA citizenship. This is the "sharing". Another "sharing" operates inside EU members, with various levels of implementations.
Something else are treaties to avoid double taxation. Very common in Europe between Schengen and non-Schengen zone, like for instance people with residency in France but work in Switzerland.
there was such a treaty USA-Russia but it was de facto nullified because banking systems are severed. There are no transfer protocols. And notice that this was valid for US citizens with RESIDENCY in Russia, not tourists.
after a while in limbo, the treaty was suspended at vitam aeternam probably:
https://rsmus.com/insights/tax-alerts/2024/united-states-suspends-income-tax-treaty-with-russia.html