The answers to the two questions are not the same. From Thomas Palley at antiwar.com:
The inevitable has happened. Russia has invaded Ukraine. It was inevitable because the US and its NATO partners had backed Russia into a corner from which it could only escape by military means.
In effect, Russia confronted a future in which the US would increasingly tighten the noose around its neck by further eastward expansion of NATO, combined with military upgrading by the US of its Eastern European NATO proxies.
Accompanying that militarization was the prospect of a ramped-up propaganda war in which western media fanned the flames of public animus against Russia. Side-by-side, US government financed entities (such as the National Endowment for Democracy and the German Marshall Fund) would seek to influence European and Russian politics with the goal of regime change.
At this stage, there are two questions. What will be done? And what should be done?