Ukraine expects an official request from the Dutch prosecution agencies on looking into the circumstances in which a collection of paintings disappeared from a Dutch museum and will welcome a visit of investigators from the Netherlands to address the matter, Ukrainian National Police chief Khatia Dekanoidze said.

"As the chief of the Ukrainian National Police, I can assure you that we expect an official inquiry letter from the Dutch Public Prosecution Service addressed to the Ukrainian Prosecutor General's Office," Dekanoidze said in a commentary for foreign media in Kyiv on Thursday.

"I'd like to assure you that we are open and are expecting investigation officials in Ukraine, who would be able to examine these materials and [conduct] an inquiry together with our investigators," she said.

Ukraine is ready to receive a Dutch delegation and cooperate in probing the incident involving the paintings, Dekanoidze said.

It was reported earlier that Westfries Museum spokesman Arthur Brand had said that an OUN battalion was in possession of a collection of 24 paintings stolen from the museum in 2005 and attempted to charge 50 million euro for it.

Ukrainian Interior Minister Arsen Avakov said Ukraine is maintaining contact with the Netherlands regarding the stolen paintings. "A group of people discovered a collection at a country house outside Donetsk, and it has been identified as one having relation to the collection that disappeared from the Dutch museum several years ago," Avakov said.

Ukrainian President Petro Poroshenko instructed the Security Service to look into the reports concerning the paintings stolen from the Netherlands.