The Ukrainian Security Service is not investigating the publication of the audio recording of a telephone conversation between U.S. Ambassador to Ukraine Geoffrey Pyatt and U.S. Assistant Secretary of State Victoria Nuland online and denies its role in this.

"The Ukrainian Security Service is not conducting any investigations into this fact," Maxim Lenko, the chief of the Security Service's investigations department, said at a news conference on Saturday.

Security Service spokesperson Lada Safonova added: "The Security Service denies that the Ukrainian special service has any relation to the publication of this video material."

Nuland used obscene language in describing the EU's role in settling the crisis in Ukraine in a telephone conversation with Pyatt, whose audio recording appeared on the Internet on Friday.

U.S. Department of State spokesperson Jen Psaki later said Nuland had apologized for her remarks to the EU.