Neither side is good, or moral, but Russia is the world's only other nuclear super-power, and IMHO our immediate national interests are better served by preventing a Sino-Russian political/economic alliance then forcing it by supporting Ukraine, as we pragmatically did with the Soviet Union during WWII.
The Soviets interned our servicemen and bombers fighting in the Pacific Theater, they committed numerous war crimes, but we decided it was more important to defeat Nazi Germany.
“... with significant support of Neo-Nazis.”
Look up Russian neo-Nazis.
If we allow Russia’s nuclear arsenal to determine our foreign policy, we might as well turn tail and run from our global presence.
By the way, the chickenshit Russians, from Medvedev to Vladimir Solovyov to Dmitry Kiselyov, have been threatening the West with nuclear annihilation ever since their blitzkrieg fsailed.