Just for reference, in the US there were protests after protests in late 2016 and early 2017. The only difference they made is tiring out the participants.
Whether you like Trump or not (I don't), Trump of 2016/2017 did not meet the threshold. (Half of America had just elected him, what would you expect?) I think Jan 6th clearly met the threshold, and Biden should have seen that Trump ends up in prison. He somehow didn't - I get that precedents are important in politics and America had never seen an ex-president in prison, so would have been very controversial - but I think it was a wrong decision and America is now paying the price.
By 2021 the Putin/MAGA forces had accreted so much power that it was safer for Republican senators to bend the knee and acquit in the impeachement trial.
The only way to win against the US is to divide it from within and/or obtain its non-involvement. By the time they send a carrier strike group, or worse, troops, it's game over. So that's what the Kremlin is doing: the thing that wouldn't have worked during the Cold War because the commie agitators would have either ended up in prison or being constantly harassed.