The Mueller report has never presented tangible evidence of Russian interference in the 2016 US elections.
Recurring pro-Kremlin disinformation narrative about the US elections.
Russian meddling in the 2016 election was established by US intelligence agencies before the publication of the Mueller report. Despite the fact that the investigation did not establish that members of the Trump Campaign conspired or coordinated with the Russian government in its election interference activities, Robert Mueller’s report clearly states that Russian interference activities DID take place. For a similar case see here: Other cases about Russia's interference can be consulted here.