Ukraine has forwarded an official letter to the United Nations protesting UN Secretary General Ban Ki-moon's remarks about Russia's role in efforts to settle the conflict in Donbas, Ukrainian presidential administration deputy chief Kostiantyn Yeliseyev said.

"A few hours ago, a letter was sent to the UN with a request to circulate this letter of protest as an official document of the UN Security Council and the UN General Assembly, respectively," he said at a press briefing in Kyiv on Friday.

"An indication that this mistake was recognized, an indication that the UN responded to our ambassador's reaction was that the text of the secretary general's speech at the relevant forum was changed and edited, and it now differs from its initial version," he said.