Iran expects first batch of Russian vaccine by Feb 4
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Two more batches are to be delivered by February 18 and 28, he added, without specifying quantities.
Iran's supreme leader Ayatollah Ali Khamenei earlier this month banned the use of vaccines made by the United States and Britain, calling them "completely untrustworthy".
Iran is fighting the Middle East's deadliest outbreak of Covid-19 with more than 57,800 dead out of over 1.4 million cases.
The country says arch enemy US has blocked its access to vaccines through Washington's tough sanctions regime.
While food and medicine are technically exempt, international banks tend to refuse transactions involving Iran.
Russia registered the jab -- named after the Soviet-era satellite -- in August last year, before the start of large-scale clinical trials, leaving some experts wary.
Hungary has also said it has reached a deal to buy the vaccine, although it has not been approved by the European Union.