You’re very misinformed.. there is NO “state church” in the Russian Federation. In fact there was no state church even under the darkest days of Bolshevism in the Soviet Union. The only state church of relevance today is the Chinese patriotic church which is subordinate to the communist party of China.
The present Russian Orthodox Church has 110 million members and has been building three churches a day for the last 10 years for an increase in 30,000 communities. Meanwhile, in Ukraine, Her Zelenski introduced a law, adopted August 20, 2024, which prohibits the Russian Orthodox Church from operating in Ukraine and bans any religious organization in Ukraine with ties to it or any other religious organizations based in countries “engaged in armed aggression against Ukraine.” It authorizes the State Service to jail priests, confiscate property and harass and persecute believers. And the Russian Orthodox Church is the biggest denomination in Ukraine.