I used to be sympathetic to the Russian position because they used the argument that they were protecting people from attack.
It wasn't about conquering Ukraine, but about guaranteeing rights for Russo-Ukrainians.
Crimea could be negotiated on in the future. LPR/DPR could become autonomous zones within the Ukrainian state, as long as they were guaranteed minority rights.
Now it's evidently clear that was never the case. All the territory taken by Russia will not be given back (unless they are defeated and forced into conceding it).
This was all about a wider geopolitical revenge fantasy against "the West" (particularly Europe). And the Russian government deliberately sacrificed and continues to sacrifice large amounts of their own people as well as "brother Ukrainians" to fulfil that fantasy goal.