A great place to spend some time is the back articles section of the Road to Emmaus Journal and there’s one article in particular that I’ve been waiting to get added: Celtomania in Eastern Siberia.
I heard Fr. Nicanor Lupeshev give a talk (and show a video) on this a few years back, and I was struck by the way in which Orthodox Christianity could interact with a very different culture. This is all good cross-cultural mission, but remember that Fr. Nicanor is a monk-priest and so has long hair, a long beard and wears a large cross over his robes.
This, then, is mission which is authentic and which does not try and pretend to be something else. Read it!