Oh god, so it wasn't just in russian. This made me go down this rabbithole to finally figure out what's up.
I got curious about the details, and, turns out, it is related to whether the short scale or long scale system is used.[0]
Short scale is the traditional million-billion-trillion-etc. Long scale is million-milliard-billion-billiard-etc. It isn't just naming for the same thing, as billion would actually have different power across those systems (power of 9 vs power of 12).
Looks like both russia and france got their own variations of it. Russia uses short scale, but swapped the name for billion to milliard. While francophone, scandinavian, and a few other countries tend to use long scale.