Well Unknown is missing and their keys were recently used [1] so maybe they've been arrested or flipped? I think some were arrested in Ukraine too [2]. The US won't have as much success extraditing people operating out of Russia however.

[1] https://www.reuters.com/technology/exclusive-governments-tur...

[2] https://www.interpol.int/en/News-and-Events/News/2021/Ransom...