Defense Secretary Pete Hegseth last week ordered U.S. Cyber Command to stand down from all planning against Russia, including offensive digital actions, according to three people familiar with the matter.

The exact duration of Hegseth’s order is unknown, though the command has been told the guidance will last for the foreseeable future, according to sources.

Russia is a bastion for cybercrime, with state-linked and criminal ransomware actors striking targets around the globe. The command has become a key player in countering the malicious activity.

Outside of internal challenges, the order could derail some of the command’s most high-profile missions involving a top U.S. digital adversary, including in Ukraine.