The magazine Profile.ru in 2015 compiled a list of Russia’s most subsidized regions.
It went exactly as you’d expect.
|#||Russian Region||%dep.||Majority Group|
|10||Jewish Autonomous oblast||60.3%||Russian|
Of the top 15 regions, where federal subsidies make up more than 50% of the local budget, six were ethnic minority republics of the Caucasus. The top two were Ingushetia and Chechnya, which also have Russia’s highest unemployment rates by far.
Only seven of the most subsidized regions were majority Russian. However, Crimea and Sevastopol have a high level of subsidies for the very understandable reason that they are under Ukrainian blockade and international sanctions, and currently undergoing economic integration with Russia; while the Altay Republic and Buryatia both have sizable non-Russian minorities. Kamchatka krai, the Jewish Autonomous oblast, and Amur oblast are the only strong majority Russian regions that source a majority of their incomes from federal subsidies.
So statistically, Russian nationalists are not wrong when they say that Russians are “feeding the Caucasus.”