The LED display at the shopping center was hacked, probably by Russians who are trying to portray Ukraine as full of Nazis to justify an unprovoked genocidal war against Ukraine.
NATO never agreed not to expand. That is a pure lie. NATO never entered into any sort of formal treaty with Russia in which it agreed to forgo expansion. Any such treaty would have required Russia to substantially de-militarize, akin to WWII peace treaties with Japan and Germany. Russia wanted to keep its massive military in order to beat up on any independence movements within its new republic and did so in brutal fashion in Chechnya--twice. Russians in the 1990s were still very sophisticated diplomatic negotiators and knew full well that any behind the scenes assurances they received regarding NATO expansion were only as good as the paper they were written on. The Russians had no interest in any enforceable treaties with the West over NATO expansion because the Russians wanted to do lots of things that would threaten all the countries that wanted to join NATO.
Russia agreed on paper, in writing, in an actual treaty to respect Ukraine's borders and its right to self determination in exchange for being relieved of having to support Ukraine as a Soviet satellite and, more importantly, in exchange for Ukraine giving up its nuclear arsenal. If Ukraine still had its nukes, Russia would have never invaded. Of course, these actual agreements are never mentioned by Putinists because as Lavrov said, the war in Ukraine was "launched against" the poor peace loving Russians (and then the laughter broke out).
Ukraine actually has one of the smallest ultra right movements in all of Europe. The ultra right block only got 2% of the vote in the last parliamentary elections. France and Italy have much larger and more powerful ultra right movements. Hungary and Turkey are pretty much run by right wing governments that include ultra right nationalists.
In Ukraine, the relationship with the Nazis past is complicated. Stepan Bandera is basically the George Washington of Ukraine. Most people in Ukraine believe that he was a true hero and all the stories about him working with the Nazis and being a fascist are just propaganda made up by the Soviet Union to discourage Ukrainian nationalism. Further, Ukrainians know that the Russians are triggered by Nazi symbols and see Nazi images, salutes, etc. as a way to flip Russia the bird. Most Ukrainians have relatives who lost immediate family in the Holodomor or were forcibly displaced by the Soviets during the great push for collectivization of farming and manufacturing. Most "ethnic Russians" (there really is no such thing) who live in the eastern part of Ukraine were brought there by the Soviets during collectivization to replace all the Ukrainians who had either been starved to death or sent to the gulags in Siberia for resisting Soviet rule. So, in Ukraine, Nazis are sort of an enemy of my enemy. But it is in no way a mainstream thing in Ukraine. It is more akin to people in the south in the US who have rebel/confederate flags.