The dark web websites associated with the Netwalker ransomware operation have been seized by law enforcement from the USA and Bulgaria. Netwalker is a Ransomware-as-a-Service (RaaS) operation that began operating in late 2019, where affiliates infect victims in return for a 60-75% share of ransom payments. The FBI has not released any information on the takedown, so it is not clear if law enforcement was able to retrieve decryption keys as part of this operation or if arrests have been made.
Source: https://www.bleepingcomputer.com/news/security/netwalker-ransomware-dark-web-sites-seized-by-law-enforcement/