Ukrainians probably hacked Yandex, because they thought, it is a Russian engine, but it is actually from Netherland/EU. They should be careful, otherwise Netherland will stop helping them with weapons pretty quickly.
We don't care. burn it to the ground
If they're still using Subversion, why would that be? Subversion lets you check out just part of a repo. (Then again, interns, I guess.)
2. Subversion lets you check out portions of your repository.
3. Subversion working copy does not have all regions history. Just a snapshot of the checked out revision.
So at least Subversion would have allowed them to limit the amount of leaked data + no revision history leaked.