Traditional cyber espionage activities have generally been viewed as fair game by the U.S. But the SolarWinds hack—which U.S. officials characterized as a Russian espionage campaign—spurred U.S. sanctions last April because of what officials said was the potential for large-scale disruption of the mostly private-sector entities that were affected. On Tuesday, Treasury reissued its rules for designating foreign adversaries for sanctions incurred by efforts to undermine cybersecurity, noting that, " the regulations were initially issued in abbreviated form for the purpose of providing immediate guidance to the public." "OFAC is amending and reissuing the regulations as a more comprehensive set of regulations that includes additional interpretive guidance and definitions, general licenses and other regulatory provisions that will provide further guidance to the public," the notice said.