Not only does the Russian Wikipedia have a high average article size (about 5500 bytes, compared with, for example, English Wikipedia at around 4100 bytes) but its graph, which has multiple peaks, seems to show that, unlike many other projects, it has more mature, medium-size articles than it does stubs.
But isn't that all Russian cyrilic letters take up 2 bytes of space? while simple latin letters only 1 byte?
My guess much of that 1400-byte will be eaten away when accounting for the cyrilic vs latin letters.
Renata