A claim by MEP Rebecca Harms that Head of Administration of Ukrainian President Andriy Kliuyev has an Austrian passport is untrue, the latter's spokesman has said.

"Andriy Kliuyev has a passport of the citizen of Ukraine, and no passports of other states," Kliuyev's press secretary, Artem Petrenko, said on Tuesday.

"Kliuyev demands that Rebecca Harms retract this false information and reserves the right to appeal to the courts," reads a report posted on the ministry's Web site.

As reported, leader of the Greens in the European Parliament Rebecca Harms said on Wednesday that a number of Ukrainian officials, including Acting Premier Arbuzov and ex-Premier Mykola Azarov, have Austrian citizenship. Azarov and Arbuzov have already denied this.