He preaches the consecration of Russia as "the end all apostacy" cure, which is false, is not what Our Lady said and will not result in Russia's - or anyone's conversion. The problem with Fr. Gruner is in what he neglects to preach.
Unlike the great saints of the past, history will show that Fr. Gruner's interpretation and preaching of the message of Fatima was false.
Fatima.org is his website. Find out what he 'preaches'. Don't put words in his mouth.