"Russia has asked for Kim's visit within this year and expects it to happen. But North Korea seems to be weighing the time and place while looking into the agenda and possible agreements with Russia," Woo was cited as saying by Yonhap news agency.
Kim is also expected to visit Seoul before the end of 2018, which would make him the first North Korean leader to set foot in the neighbouring country.
According to experts, the visit could take place in the first week of December.
The two Koreas have been technically at war for over six decades as the Korean War in the 1950s had ended with an armistice and not a peace treaty.
Woo added that Putin was also set to visit Seoul in the first half of 2019.
The details of the visit would be finalized soon with Moscow, where Seoul is likely to push for a free trade agreement between the two countries, he added.
In June, Putin and South Korean President Moon Jae-in had agreed to initiate a dialogue for signing of the treaty.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)