| − | During the era of the [[Soviet Union]], membership in the Academy was limited to citizenship within the USSR, and rarely were non-citizens elected. Membership is based upon contributions to science in many fields; currently, there are five hundred full members (''acaemicians'') and a similar number of corresponding members world-wide. The majority of members are Russian citizens. | + | During the era of the [[Soviet Union]], membership in the Academy was limited to citizenship within the USSR, and rarely were non-citizens elected. Membership is based upon contributions to science in many fields; currently, there are five hundred full members (''acaemicians'') and a similar number of corresponding members worldwide. The majority of members are Russian citizens. |