From Russian wikipedia: States that there are total around 12 000 Russian crime groups with membership of 160 000. Ndragheta has 150 groups and 5000 members.
Keep in mind that B) that figure for the 'Ndrangheta doesn't include associates, which could be 10 times the number of made members; B) the figure for the Russian groups likely includes other groups that are not Russian, i.e. Ukrainian and people from other Eastern European countries that often get lumped in under the "Russian Mafia" umbrella; and C) many of these Eurasian groups don't have the distinction of "made" members so the numbers will appear bigger.
To make it a fair comparison you'd also have to include all the Italian Crime Syndicates rather than just the Calabrians.
