They have some plans: Ihnat comments on MiG-31K flight from Belarus to Russia

We should not expect that Russian MiGs will not be on the territory of Belarus, they may return.
This was stated by the spokesperson for the Air Force of the Ukrainian Armed Forces, Colonel Yuriy Ihnat, commenting on the flight of MiG-31K dagger-bearers from Belarus to Russia yesterday.
He suggested that perhaps the Russians had some technical issues, which is why they were flying the planes back and forth.
– They will fly back and forth as they flew. They obviously have some plans. It has already happened. They had training flights, then there was an alarm for about 20 minutes. They also flew to other airfields, to the territory of Russia. Perhaps there are some technical nuances there. The MiGs flew in from Russia from their base airfields, so there may be some things that need to be maintained or operated,” Ihnat said on Kyiv TV channel.
As a reminder, on April 6, three MiG-31K fighters of the Russian Aerospace Forces, which are potential carriers of the Kinzhal missiles, left the territory of Belarus.
The aircraft had been stationed at the airfield in Machulishchi since December 13, 2022.