MOSCOW, May 21 - Russian oil producer Tatneft has demanded more than $1 billion in compensation from the Ukrainian authorities for infringements on its rights as a shareholder in the Ukrtatnafta oil refinery, Tatneft told Interfax.

"The claim has been posted to Ukraine's official agencies, which represent the state as respondent in this dispute. The claim is for more than $1 billion," the company said.