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Ukraine's security service has raided a historic monastery in Kyiv in an operation it says was aimed at stopping Russian agents using the site for sabotage, intelligence or weapons.
The Pechersk Lavra Orthodox Christian monastery dates back to the 11th Century and is now a seat of Ukraine's Orthodox Church.
The Church split from the Moscow patriarchate after Russia's invasion.
The Kremlin said the raid was another attack by Kyiv on Russian Orthodoxy.
The SBU security service in Kyiv announced on Tuesday it was conducting "counter-intelligence measures" to target the "subversive activities" of Russian special services. It said there was an increased risk of attack, sabotage and hostage-taking in places that attracted large groups of citizens.
The monastery, which is a Unesco World Heritage site, was one of a number of Orthodox churches raided on Tuesday, as authorities responded to complaints that clergy had been glorifying Russia and could be in league with the Kremlin.
A criminal inquiry was opened a week ago after a video emerged of pro-Russian propaganda being sung, referring to the awakening of Mother Russia.
Kremlin spokesman Dmitry Peskov accused Ukraine of being "at war" with the Orthodox Church for a long time. Patriarch Kirill condemned an "act of intimidation of believers".
As head of the Russian Church, the patriarch is widely seen as an ally of President Vladimir Putin and has given his full backing to the Russian war in Ukraine.
Shortly after the invasion began, he painted the war as a struggle of "metaphysical significance" against sin and Western pressure to hold "gay parades".
More recently he said any Russian who enlisted for combat in Ukraine was committing "an act that is tantamount to a sacrifice".
In Ukraine the raids were broadly welcomed, because the Ukrainian Orthodox Church (UOC) split from Moscow only six months ago after centuries under its control, leaving a suspicion that it is still used by the Kremlin to sway public opinion in Ukraine.
In 2018 the rest of the country's Orthodox community joined a new Orthodox Church of Ukraine that was later granted independence by the global Orthodox movement.
Ukrainian political analyst Valentyn Hladkykh said the clergy and believers of the UOC ultimately had to decide who they served: "God or the Kremlin executioner."