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According to local reports, the soldier came to the church and asked (presumably the worshippers): "How many more people must die before you stop going to the Moscow Patriarchate?".
The military officer was detained by law enforcement officers for and act of "petty hooliganism", but in the film captured on mobile phone one the priests can be seen kicking the soldier and the latter being dragged away.
The soldier does appear drunk, perhaps, but this incident would have touched a raw nerve with people who regard many of the priests in the Russian Orthodox church of being little more than agents of the Kremlin. There are now two rival branches of the Ukrainian church: the Ukrainian Orthodox Church and the Orthodox Church of Ukraine (anyone who mentions Monty Python will be asked to leave :-) )
There's currently a stand off in the Kyiv Perchersk Lavra monastery complex related to rival branches of the Orthodox church in Ukraine, Link follows for anyone brave or patient enough to delve in. There'll be a quiz later :-)