Why do they even go through this much trouble when they can just count votes such that Единая Россия comes out as a winner, like they did on every election I remember. They stuff ballots into boxes. They invalidate ballots with "wrong" votes. They just simply change the numbers in the protocols without anyone rechecking or recounting. Worst of all, the people who do it are usually school teachers, because polling sta…
It's terribly hard to actually falsify the vote counts across thousands of polling places. In theory, someone observing the process, as should be legal everywhere, will notice the irregularities. It's not impossible, obviously–especially if you have full control of at least anyone important. But plausible deniability suffers rather fast, and that's a valuable assets at the Putin-level of dic(tator|k)ishness.
It's strange that people really don't realize how easy it is to cheat; just a little bit of leverage in the right place can tip an election.