My sketchy understanding of the timeline here is Arsen Avakov was in power from 2014 as Minister of Internal Affairs, he consolidated power in that time and gave support (financial and moral) to far right forces within Ukraine.
Zelensky came to power in 2019, and reappointed Avakov. This was criticised by his supporters but perhaps justified as necessary realpolitik "President Zelensky needs him because of his links to the dark side of the Ukrainian deep state, against which the president’s young reformers are often powerless." - a deal with the devil.
Zelenksy also supposedly said the appointment would be temporary, and sure enough Avakov was kicked out in 2021.
A sympathetic reading would be the Zelensky inherited a state that gave support to far right forces and chose a strategy to edge away from that over time.
I of course dont know, I can only glean from english language articles
I think Avakov's trick of supporting the security forces and the military and, at the same time, the militia , the positioning, and influence of the far right forces, and the complex realpoilitiks can be illustrated by the following episode.
In 2019 France and Germany offered to facilitate a four-way meeting with Zelensky and Putin . In October of that year , the Ukrainian Armed Forces ordered the retreat of Ukrainian troops from Zolote and two other cities to increase the distance between the front lines ( they were 30 meters, throwing distance of a hand grenade) to try and avoid or at least reduce the constant skirmishes and ceasefire violations. On the Russian separatist side, a similar 'retreat' would occur. There was widespread condemnation of this move by several rightwing groups and politicians. Thousands of Ukrainians including Zelensky’s predecessor Petro Poroshenko protested in the capital Kiev and other cities, calling a pullback of troops as an act of “surrender.” One of the MPs from European Solidarity ( Poroshenko's party) Sofia Fedyna said on her YouTube channel “Mr. President thinks he is immortal,” she said in a video shared on Facebook. “A grenade may explode there, by chance. And it would be the nicest if this happened during Moscow’s shelling when someone comes to the front line wearing a white or blue shirt.”
Biletsky, head of Azov's National Corps and the Azov Battalion, threatened Zelensky on his YouTube channel that more veterans would head to Zolote if the president tried to evict them from the town. “There will be thousands there instead of several dozen,” he said, to "defend the positions conquered with blood".
Zelensky spent a night in Zolote and as part of his visit went to talk to the National Corps members who were had refused to move out of the area ( the Marines had moved). There is an incredible video around that shows the elected President of Ukraine ( 73% of the vote) having to argue with a member of Azov's National Corps (a chap called Denys Yantar who had served in the Azov Battalion) . Despite having to be reminded by Zelensky that he was in fact the President Yanter was quoted afterward as saying "I don't know what his [Zelensky's] further plan is, but we'll keep on staying here while there is a threat of senseless disengagement and loss of Ukraine's territory," he told the "No to Surrender Last Roadblock" Telegram channel in a video comment.
Avakov intervened and the National Corps retreated.
Two days later Avakov visited the Azov training camp in Mariopol and made it clear that “the special force Azov is a legal unit of the Ukrainian National Guard and its soldiers have been exemplary in the tasks of combat performed in the defense of the homeland”. “The information campaign about the alleged propagation of Nazi ideology among the military is a deliberate attempt to discredit unity, particularly among Ukraine's international partners, and provoke a crisis in the relationship with our allies”, continued the minister. In terms of visual communication, the Azov Regiment has recently shown particular care not to be politically connected"