This variant of SARS-CoV-2 was detected in Russia in January 2021. According to the published data, WHO has been closely monitoring the Russian AT.1 strain since June 9: it is on the list for monitoring (Alerts for Further Monitoring).
There are 12 COVID-19 variants on the list for further study. These options, including the Russian one, are not designated by the letter of the Greek alphabet. There is insufficient information to include them in the Variants of Interest.
At the moment, the WHO (Variants of Concern) is concerned about four strains of COVID-19: “alpha” of British origin, South African variant “beta”, first registered in Brazil “gamma” and “Indian” strain “delta”.
WHO decided to label the most dangerous strains with the letters of the Greek alphabet in early June. The organization explained that before that there was a practice to name them according to the countries where these strains were first discovered.