US President Joe Biden said on Saturday that "we're not certain" who is behind the attack. "The initial thinking was it was not the Russian government but we're not sure yet," he said.

The US President also confirmed that he directed US intelligence agencies to search for the party responsible for a complex cyber-attack with ransomware programs that infected hundreds of American companies, and prompted the suspicion of the involvement of Russian cyber groups.

Biden pointed out that the identity of the party responsible for the attack was not identified, adding that he had instructed US intelligence agencies to investigate the matter.

He revealed that he had directed U.S. intelligence agencies to investigate, and the United States will respond if they determine Russia is to blame.

This came in response to a question about the attack, during his visit to Michigan to promote the vaccination program.

Director of the electronic virus research department at Kaspersky Lab, Vyacheslav Zakorzhevsky, said that companies in Ukraine, Turkey, and Germany, were attacked by the encrypted Ransomware virus,  but Russia had the highest numbers. 

The Kyiv Metro Network and the Odesa International Airport administration in Ukraine had announced being exposed to cyber-attacks. 

On the other hand, the Russian Interfax agency and the Fontanka electronic bulletin in St.Petersburg also said they were cyber-attacked.

SolarWinds, the Colonial Pipeline, which transports fuel in the southeastern United States, and even the JBS meat production company are American companies that were recently targeted by the Ransomware virus, which has slowed or even stopped their production.

It is noteworthy that the Geneva summit, between US Presidents Joe Biden and Russian Vladimir Putin on June 16, came to overcome the "major challenges" between the two parties, especially after the tension in the atmosphere recently.