As the world's attention is focused on Russia's claims on Ukraine, there has been less reporting on the tensions between Russian and Ukrainian branches of the Orthodox Church. This AP background article by Prof. J. Eugene Clay points out:
Two different Orthodox churches claim to be the one true Ukrainian Orthodox Church for the Ukrainian people... The older and larger church is the Ukrainian Orthodox Church – Moscow Patriarchate.... A branch of the Russian Orthodox Church, it is under the spiritual authority of Patriarch Kirill of Moscow.....
By contrast, the second, newer church, the Orthodox Church of Ukraine, celebrates its independence from Moscow.... In January 2019, [Constantinople] Patriarch Bartholomew formally recognized the Orthodox Church of Ukraine as a separate, independent and equal member of the worldwide communion of Orthodox churches.
Vladimir Putin's widely reported Feb. 21 speech on the Ukraine (full text) included Russian grievances as to this religious split. Putin said in part:
Kiev continues to prepare the destruction of the Ukrainian Orthodox Church of the Moscow Patriarchate. This is not an emotional judgement; proof of this can be found in concrete decisions and documents. The Ukrainian authorities have cynically turned the tragedy of the schism into an instrument of state policy. The current authorities do not react to the Ukrainian people’s appeals to abolish the laws that are infringing on believers’ rights. Moreover, new draft laws directed against the clergy and millions of parishioners of the Ukrainian Orthodox Church of the Moscow Patriarchate have been registered in the Verkhovna Rada.