Russian President Vladimir Putin and US President Joe Biden have agreed to develop a cyber-security arrangement between the two countries after discussing the issue of ransomware at their summit in Geneva.
Mr Biden says he and Mr Putin will start consultations "to begin to bring some order" after recent high-profile attacks by criminal gangs on critical US companies.
But talks are likely to be complex after both sides disagreed about who was to blame for the growing problem of ransomware.
President Biden says he raised a recent attack which took a major US fuel pipeline offline with Mr Putin.
The attack was carried out by hacker group Darkside, which is suspected to be Russian.
Mr Biden says he gave Mr Putin a list of 16 specific critical entities that should be considered "off-limits" from future cyber-attacks.
However President Putin told reporters that the Colonial Pipeline attack and others have "nothing to do with Russian authorities".
Mr Putin also claimed he had been told by US sources that most cyber-attacks originate from the US, and that Russian attempts to get information about attacks originating from the US are being ignored.