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Russia is about twice as wealthy per capita than Moldova. Moldova and Armenia are 3ed and 4th poorest, but I'm not sure which is the poorest of the two.Probably off subject but just a personal anecdote…when I arrived in Belgorod I had to go through medical examinations for my visa. There were probably 30-40 of us that day and the vast majority were carrying Moldovan passports. Not sure how the economy is there, but for them to emigrate to Russia for what looked like menial jobs is telling.
Ukraine and Kosovo are the poorest countries of all in that area. The discrepancy between the pairs is caused by looking at both GDP and GNI to gauge the per person wealth.