Ukrainian President Volodymyr Zelensky's aide Andriy Yermak has said there are forces in Ukraine that were not interested in a prisoner swap.

"I have no evidence on those who tried to disrupt everything. But I can frankly say there are forces here, within the country, that were not interested in the exchange. Fortunately, we have a new president who fulfills what he promised," he said in an interview with the Ukrayinska Pravda online newspaper.

In addition, Yermak confirmed that Viktor Medvedchuk, the Kremlin's closest ally in Ukraine, had not participated in the prisoner swap effort.

"I'm not aware of any attempts. I am aware of the position of our president. He has stated many times that he does not envisage any involvement of Mr. Medvedchuk in any processes. And so I can say that Mr. Medvedchuk has not taken any part, we have never met with him, we've never talked. I think all his trips to Russia are his personal PR campaign," he added.

Read alsoZelensky's aide assesses possibility of another prisoner swap by year-end

As UNIAN reported earlier, 24 Ukrainian POW sailors captured by Russian special forces near the Kerch Strait in November 2018, and 11 political prisoners were returned by Russia to Ukraine as part of prisoner exchange on Sept 7. The political prisoners include Roman Sushchenko, Oleh Sentsov, Oleksandr Kolchenko, Volodymyr Balukh, Stanislav Klykh, Mykola Karpyuk, Oleksiy Syzonovych, Pavlo Hryb, Edem Bekirov, Yevhen Panov, and Artur Panov.

Meanwhile, 35 people were transferred to Russia. All of them were convicted or tried on various charges.