It is not quite so....
independent, family farms surely exist in Russia today.
but... efficient agriculture requires large farms. Russia always had this problem, and even the Russian empire suffered hunger years every few years!
So the reason why Russia now can export is — in a bizarre way — the forced collectivization of the 1930s by Stalin (intermediate result: yes, large farms, generally filled with people unpaid and unwilling to work) and allowing these farms to behave capitalist under Putin.
Nope. At least not if I interpret you correctly. The farms in Russia are on AVERAGE tiny, not just MODE. So it’s not even that there are a lot of tiny farms with a few huge ones. So, if you’re saying that Stalin’s collectivization has allowed for highly productive mega-farms... no, that’s not it.
Now, I’m NOT going to the opposite extreme either. I’m sure there are SOME mega-farms out there, and from what I’ve read about Russian farms’ crop diversity and what I would expect about distribution, I would imagine that they’re the ones producing food for export. But whereas dividing up oil companies into shares failed disastrously, when collectivist farms were divided up, they thrived: You can’t feed your family with a stock certificate, but you can feed them with a farm.