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How to fill in the passport type of Russian Federal Immigration Service?

Kalmyk is an autonomous republic of the former Soviet Union. The passport to go there is the same as the passport to Russia. The invitation letter is from kalmyk, which is about 3,000-4,000 yuan excluding the agency fee. Capital: Elista, more than 300 kilometers away from Volgograd. The residents are mainly Russians and Kalmyks.