The Russian authorities have some valid concerns about the JWs.
But their police state methods are possibly what made the Court rule as it did.
But then there's this: (source Russia ceases to be a Party to the European Convention on Human Rights on 16 September 2022 - Newsroom (coe.int) )
Following its expulsion from the Council of Europe on 16 March 2022, the Russian Federation will cease to be a High Contracting Party to the European Convention on Human Rights on 16 September 2022.