No, it isn't. It is a fight against a large country that believes it has the right to bring full-scale war of conquest back to Europe for simple territorial gain and greed.
That should be strongly opposed no matter the merits of the governments involved.
That being said, if you want to compare their degree of democracy, Ukraine has had six different Presidents in the 21st century, while Russia has had just one.
Russia is not really a large country. The population is less than the Indonesian Island of Java.
The Russian GDP is said to be less than the American State of Texas and slightly greater than Ohio
Russia covers vast areas but so does Canada. Since the western money and ability left Russia, there is now no there there
“...if you want to compare their degree of democracy, Ukraine has had six different Presidents in the 21st century, while Russia has had just one...”
Too many Russians have to have their stupid dictator whether it is almost three decades of Stalin, or almost two decades of Brezhnev, or 23 years of the current little creep. But there are brave and good Russians who resist tyranny and corruption on the home front. Mikhail Khodorkovsky, Alexei Navalny, Olga Smirnova, Yulia Latynina, and Boris Nemtsov are among those who took a stand.
You don’t understand what “democracy” means. And you know that the war is not about territory.
They are no mass graves for the “critics of the regime” in Russia on top of that.