Ruling in the case Ukraine v. Russia (re Crimea), the European Court of Human Rights unanimously found June 25 that Russia is guilty of a pattern of human rights violations since 2014 in Crimea, as codified under the European Convention on Human Rights a
Russia withdrew from the ECHR. Presumably whatever specific incidents they're talking about were before that, but I'm not sure how much Russia is going to care about that.
Russia also terminated ECHR jurisdiction in 2022.
LONDON, June 7 (Reuters) - Russia's parliament on Tuesday passed a pair of bills ending the European Court of Human Rights’ jurisdiction in the country, a rupture provoked by Russia's war in Ukraine.
I'm not sure whether that ended authority over cases on issues prior to that time or not, in each of the eyes of Russia and the ECHR. But I wouldn't be surprised if Russia's position is that it did, as there wouldn't be much point to also terminating jurisdiction after leaving if it didn't.