Authorities in Russia say they have dismantled the ransomware crime group REvil and charged several of its members.
The United States had offered a reward of up to $10 million for information leading to the gang members, following ransomware attacks.
Russia’s intelligence bureau FSB said the group had “ceased to exist”.
However, it does not appear that any Russian members of the gang will be extradited to the United States.
The agency said it had acted after being provided with information about the REvil gang by the US.
According to the Russian state news service Tass, REvil “developed malicious software” and “organised the theft of money from the bank accounts of foreign citizens”.
The FSB said it had seized more than 426 million rubles, including in cryptocurrency.
It also seized more than 20 “premium cars” which had been purchased with the proceeds of crime.
“The organised criminal association has ceased to exist and the information infrastructure used for criminal purposes was neutralised,” the FSB said in a statement.
These arrests are a monumental moment in cyber-crime and cyber-relations between the US and Russia.
For years, Russia has ignored and denied accusations that Russian ransomware hackers are allowed safe harbour in the country to attack western targets.