You will typically need the original signed and sealed Russian document, a colour scan of your passport bio page and UAE visa or entry stamp, a signed authorisation letter if a family member or agent holds the original in Russia, and a purpose letter where required.
Documents submitted directly to the embassy without proper local notarisation and Russian Ministry of Foreign Affairs authentication are rejected. Only originals with wet signatures and seals are accepted; scanned PDFs cannot be attested. Any name mismatch between certificate, passport and Emirates ID blocks downstream applications. And photocopies or laminated originals must be re-issued before attestation can proceed.