Moreover to us on the site came observers from the OSCE, and also did not find any violations.
Since you accept the OSCE as a valid source: here are a few of their remarks regarding the 2016 parliamentary election. I have based it on the English version of the preliminary report, since it is only 16 pages whereas the definitive version is TLDR.
A Russian language version can be found as well at the launch page.
Launch page for the OSCE findings:https://www.osce.org/odihr/elections/russia/252136
The specific report:https://www.osce.org/odihr/elections/ru ... nload=true
page 1 wrote:
Local authorities did not always treat the contestants equally, and instances of misuse of administrative resources were noted. The election day generally proceeded in an orderly manner, but numerous procedural irregularities were noted during counting
The legal framework remains overly complex and micro-regulates the electoral process, including through unnecessary restrictions on candidate registration, formation of party blocks, campaigning, media and citizen observation.
A number of lower-level commissions lacked impartiality and independence, and their performance was criticized
, the inclusiveness of the candidate registration process was diminished by legal limitations on the right to stand and by excessive registration requirements, particularly for independent candidates, that are contrary to international obligations and standards.
page 2 wrote:
There were also attempts by local state structures to influence voter choice and to pressure them into voting for the governing party. The CEC publicly highlighted such violations reported from nearly half of the federal subjects ("voting disctricts", see page 3).
OSCE/ODIHR EOM media monitoring results show that media failed to grant contestants with equitable coverage, with the ruling party receiving more editorial coverage than other contestants. The vast majority of editorial coverage on national channels – 63 to 91 per cent – was dedicated to government officials
And that's just the first two pages.
Admittedly, I did not read the entire report in detail. I read the first two pages and skimmed through the rest. My impression is that the voting itself went mostly equitable, with a few local commisioners overstepping their bounds. The count itself was also fair, and both the OSCE (EU) and CEC (Russia) were open in reporting errors. That having been said, the run-up to the election was not fair. There was no evenly divided (public access) media attention, there where excessive road blocks against forming new parties as well as against forming new coalitions.
One mayor issue I would highlight is that the CEC highlighted violations reported by nearly half the federal subjects ("voting disctricts
"). This could of course be anything from subjets with a single complaint to subjects with large numbers of complaints, and from subjects with trivial complaints to subjects with mayor fraud. The (preliminary) report does not delve into this. Nonetheless, that's significantly more then commonly found in the "traditional democracies" (for lack of a better word).