The required annual amount is approximately €10,000–€12,000 (varying based on accommodation costs). From Russia, OTP Bank is a viable transfer channel. Key documents: sponsorship letter, sponsor's proof of income (e.g., Russian tax form 2-NDFL, self-employment/IP certificates, or property sales), and evidence of the fund transfer (or cash statement). Applicants must fill out monthly income/expense and source explanation forms. Minors also require additional banking compliance checks and potentially a legal guardian in Austria. Detailed guidance can be found on 'avstwiki'.
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