North Korea's state media is reporting Russia's interior minister recently visited the regime.
Watchers say this signals North Korean leader Kim Jong-un might soon visit Russia for a summit with Russian President Vladimir Putin.
The Korean Central News Agency says Vladimir Kolokoltsev and other Russian officials arrived in Pyeongyang on Monday.
It didn't include details such as the purpose or duration of the visit.
Watchers say it could be related to Kim Jong-un's possible visit to Russia sometime in April.