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For anyone heading overseas to teach English as a foreign language there are many things to consider before departure, not least, how will I cope with an unknown language?
Although it is unlikely that you will immediately be able to breeze through a Tolstoy novel in Russian without difficulty, it should give you a basic understanding of the language before you arrive on the ground.
If you have chosen Russia as your destination then you should take a look at this useful guide on learning to read Russian in 15 minutes.