Ukraine said on Saturday that Russian security services were involved in a recent cyber-attack on the country, with the aim of destroying important data and spreading panic.
The country's SBU security service says it has found evidence suggesting Russian security services were involved, according to a statement released Saturday.
In its statement, SBU said it obtained data with international antivirus companies that led it to conclude that "the same hackers are involved in the attacks, which  using Telebots and BlackEnergy in December 2016."
But Russian firms such as oil production company Rosneft were also made victims of the attack, leading some cybersecurity experts to suggest Moscow isn't responsible, said BBC.
Last week's attack, a new strain of the Petya ransomware dubbed GoldenEye, comes almost two months after WannaCry crippled more than 200,000 computers across 150 countries. Cybersecurity company BitDefender and Microsoft found that the new bug first struck Ukraine via local tax accounting software MEDoc. Hackers had hid GoldenEye in the programme's software update and caused a widespread infection.