True, but understanding their motivations goes further than taking their narrative at face value.
The Russian narrative swings from fear of future deployments of American missiles in Ukraine, as if nuclear ballistic submarines can't show up in the Bering sea in a matter of days. And de-nazifaction as if the Kremlin regime is a pillar of freedom and democracy.
Both arguments are rather flimsy at best. It looks to me the main issue is Ukraine's democracy, it looks like the Kremlin cannot tolerate bordering a democracy not run by some kind of autocratic vassal.
It kind of make sense since there is a large Russian/Russian-speaking community in Ukraine. What the Kremlin can't tolerate is a neighbor with greener grass on their side of the fence. Because if the Russian people witnessed a blooming economy and growth in Ukraine after the popular deposition of their then Russian-adjacent president, they might get ideas. So days after the event Russia invaded crimea and labeled the Ukrainian government Nazis.
Simply because the Russian people had to see that popular revolutions only lead to misery.
Russia is not justified, which is why there has been such unification in the West and silence from Russia's powerful allies. Putin made a mistake.