The jurisdiction of the court extends to nearly all European states, with the exception of Belarus, the Vatican City, and the predominantly Central Asian Kazakhstan.
But,
In 2015, Russia adopted a law allowing it to overrule judgements from the ECtHR, codifying an earlier Russian Constitutional Court decision which ruled that Russia could refuse to recognize an ECtHR decision if it conflicted with the Russian Constitution.
Compare,
Other countries have also moved to restrict the binding nature of the ECtHR judgments, subject to the countries' own constitutional principles. In 2004, the Federal Constitutional Court of Germany ruled that judgments handed down by the ECtHR are not always binding on German courts.
(All https://en.wikipedia.org/wiki/European_Court_of_Human_Rights
And the vote on the new Constitution amendments is scheduled to proceed in a few days.
1) European Court of Human Rights will publish a set of decisions about Russia blocking access to different websites. [0] All those decisions are expected to be in favour of plaintiffs.
2) Court would soon communicate first case about blocking of Telegram by collateral party.
3) Communication of primary case by Telegram LLC [1] is a matter of weeks, it was delayed due to company restructurizing.
Russia gonna face direct lifting order from ECHR and that would be a Zugzwang: position, from which any move is losing.
Besides, blocking of Telegram for at leas last year and a half was inefficient, if not nonexistent. It is a common subject of satire towards state actors responsible for blocking.
So, I take it as a face-saving move, according to Hanlon's razor.
[0] https://hudoc.echr.coe.int/app/conversion/pdf?library=ECHR&i...
[1] https://agora.legal/fs/a_delo2doc/97_file_Report_2018.pdf