And because my curiosity got the better of me, I went looking for info on the Soviet Navy after 1990.
I should have thought to check Haze Gray & Underway earlier but alas, I didn't. Anyway, if you are prepared to trawl through the various entries for the ship classes, they sometimes list those ships struck off the register and the year this took place.
For example: from the page on gun cruisers,
"Sverdlov class cruiser Aleksandr Suvorov at sea. Complete in 1953, she was stricken in 1990"
So here's the link,
https://www.hazegray.org/features/russia/
Like you said, down the rabbithole...
EDIT:
Bah! Down the rabbithole indeed!
The page I linked to at Haze Grey has the following feature
https://www.hazegray.org/features/hiddensee/