Russia-linked group REvil cybercrime gang, allegedly known for extorting $11 million from the meat-processor JBS after a Memorial Day attack, infected thousands of victims in at least 17 countries on Friday.
The FBI said in a statement that while it was investigating the attack, its scale may make it so that they are unable to respond to each victim individually.
President Joe Biden suggested Saturday the U.S. would respond if it was determined that the Kremlin is at all involved.
A spokesman for Russian President Vladimir Putin said no, but suggested it could be discussed by the two countries in consultations on cybersecurity issues for which no timeline has been specified.