Why today? Perhaps the answer lies in the field of sociology or psychology.
As pointed out by others before me, this mainly pushes affected customers to transfer domains to Russia-based providers, increasing their profits (a little) and sphere of control (a little more).
...But it makes them feel better?
It's irrelevant what previously occurred by other governments.
All of the bombardments I mentioned happened on the same exact days as the bombardments in Ukraine. And how you can dismiss the killing of people in other countries as 'irrelevant' is astonishing.
> Why the selective enforcement against just this one particular regime?
Providing the plausible reason why there was selective enforcement for that one particular regime, and thus the irrelevancy of what previously occurred by other governments.
Your next, perhaps still valid question, is why they aren't continuing to apply this policy to your other cited circumstances.
What about the American regime currently bombing Somalia?
Or the Saudi regime currently bombing Yemen?
Or the Israeli regime currently bombing Syria?
Or the ... regime currently bombing ...? You get the point, surely.
Why the selective enforcement against just this one particular regime?