Directly from the article that was linked in the post:

Ukraine was the only country besides the US voting against the resolution.

The Ministry of Foreign Affairs of Ukraine explained its opposition with the Russia’s current repressive policy, its attempt to take full credit for the victory over the Nazi Germany, and omission of important elements in the resolution, including numerous mass crimes, including genocide, deportation and repression by Stalin’s Soviet regime.

"By contributing to the victory of humanity over Nazism and surviving the seventy-year-old oppression of the communist regime, the Ukrainian people consistently condemn the crimes of totalitarian regimes and how no one else seeks to put an end to human hatred ideologies, such as Nazism and neo-Nazism, around the world.

"Our state is also consistently advocating for human rights, the rule of law and democracy as the key to preventing new authoritarian regimes, which have become the main triggers of the most bloody crimes in Europe in the twentieth century, both against their own citizens and against entire peoples.

"The text of the draft resolution also silent the fact that the end of World War II was not the final victory over totalitarian ideologies, and one of its results was, on the contrary, the enslavement of individual European peoples and the strengthening of the communist totalitarian regime responsible for many mass crimes, including genocides, deportations, repression.

"Besides, current Russia is all justifying the signing of the Molotov-Ribbentrop pact, which has unleashed hands on Nazi and Communist regimes to implement their aggressive plans from Europe. The text of the resolution also lacks Soviet mass terror, which, in addition to national and ethnic, occurred by the so-called class and social sign, which had resulted in a full-time labeling of the ′′ enemy of the people ′′ that mostly led to their physical extinction.

"The Russian Federation continues to stubbornly deny recognition of the genocide of the Ukrainian people of the Holodomor organization of 1932-1933 years and deportation of the Crimean Tatar people of 1944 as well as other peoples.

"At the same time, Russia not only does not condemn the crimes of the communist regime, but also widely fueled chauvinist and xenophobic moods in Russian society and heroizes the image of Stalin. It’s a shame, but this year the Russian side went even further and tried to turn the UN GA document into the heroization of the communist and Soviet past, including the Stalinist regime, adding to the project a position to protect their symbolism.

"The recent decision of the Russian court against Russian historian Yuri Dmitriev, who is known for his research on Stalinistic great terror, and in particular the tragedy in Sandarmokh, where the famous representatives of Ukrainian revival were shot.

"And don’t forget that while one hand the Kremlin introduces a resolution against the heroization of Nazism with one hand, it generously supports radical movements that profess extreme ideologies both left and right spectrum.

"The end of aggression against Ukraine, restoration of respect for international law and good recognition and condemnation of the crimes of the communist totalitarian regime should be a real affirmation of Moscow’s commitment to fight intolerance and racial discrimination.

As it was obvious to anyone with a functioning brain at the time, this resolution was a sham put out by Russia in attempt to justify their illegal invasion of Ukraine. As you can clearly see, Ukraine very openly condemned Nazism in all its forms. They, along with the rest of the democratic world, refused to express support to Russia’s piss poor attempt at justifying their genocide.

Next time, read the articles you post instead of Googling for confirmation bias and posting the first Reddit post that pops us. Skimming the Reddit title post is not enough.