A spokesman says the UN secretary-general had a brief meeting with the head of North Korea's parliament when both were in Moscow over the weekend.
Ban Ki-moon's deputy spokesman, Farhan Haq, told reporters Monday that no details would be released from that meeting.
Ban is South Korean and that country's former foreign minister. His planned attendance at the Victory Day celebration in Moscow had raised questions of whether he would meet North Korean leader Kim Jong Un, who also had been invited.
But North Korea announced last week that senior statesman Kim Yong Nam would go to Moscow instead.
North and South Korea remain technically at war, since the Korean War ended in a tenuous cease-fire.