Ukraine on Wednesday accused Russian hackers of targeting its power grid, financial system and other infrastructure with a new type of virus that attacks industrial processes, the latest in a series of cyberoffensives against the country.

Oleksandr Tkachuk, Ukraine's security service chief of staff, said at a press conference that the attacks were orchestrated by the Russian security service with help from private software firms and criminal hackers, and looked like they were designed by the same people who created malware known as "BlackEnergy."

Russia's Federal Security Service (FSB) could not be reached for comment. Moscow has repeatedly denied accusations from Kiev that it has been waging a "cyberwar" on Ukraine since relations between the two countries collapsed following Moscow's 2014 annexation of Crimea and the outbreak of Russian-backed separatist fighting in Ukraine's Donbass region.