Indeed, pro-Russian media have said the leaders of the Azov Battalion are yet to surrender.

This controversial unit of the Ukrainian armed forces is a bête noir of the Russians, featuring prominently in Kremlin propaganda. Russia accuses them of being Nazis, something Ukraine has always denied.

Meanwhile, some Russian law makers have said they should be treated as war criminals rather than prisoners of war. Vyacheslav Volodin, the Speaker of the Duma, Russia’s Parliament, said "Nazi criminals should not be exchanged".

https://www.bbc.com/news/live/world-europe-61461805

Azov Battalion is reportedly a unit of the NGU, backed by Ukraine's Ministry of Internal Affairs. Despite its possible official background in Ukraine, Azov Battalion is known in the West for its extreme neo-Nazi stance, and for its suspected involvement in a number of terrorist attacks and separatist incitement incidents in various countries and regions, including the riots in China's Hong Kong Special Administrative Region in 2019.

Ironically, despite being widely regarded as a threat to world security and an enemy of human civilization, Azov Battalion was found to have ties not only with the Ukraine authorities but also with the US. 

https://www.globaltimes.cn/page/202203/1254217.shtml