When Putin visited North Korea, he visited a small Russian Orthodox church, which had been built there, in 2007. Putin said a prayer in the church, lit a candle and made the sign of the cross, and spoke with the pastor. This was televised on TV, effectively declaring to North Korea, that Russia is a Christian nation.
Russia frequently uses the establishment of Russian Orthodox churches as a form of ‘soft power’ in nations around the globe. It’s a part of Russia expanding it’s culture and influence. After the establishment of the church in 2007, 4 North Koreans were sent to a Russian Orthodox seminary, to in order to conduct services at the church, back in North Korea.