https://meduza.io/en/feature/2024/03/21/putin-2024Meduza breaks down the evidence pointing to the most fraudulent elections in modern Russian history
Some of the statistical anomalies in the data show clear evidence of falsifications since they can’t be explained by anything else. Others appear highly suspicious but could theoretically have other causes. In other words, anomalies come in different forms and should be examined individually.
The two main anomalies prevalent in almost all recent Russian elections are a correlation between the ruling party candidate’s results and the turnout, and spikes at round values for both voter turnout and election results. This time, the magnitude of both anomalies has reached unprecedented levels. [...] There’s no longer a cluster of normal polling stations in Russia from which the true average percentage of votes cast for candidates can be calculated.
Lots of charts at the link.