Lithuanian Minister of Defense appeared on Lithuanian TV yesterday around 2200 EEST. According to him, a Belorussian fighter jet MiG-29 was scrambled while the pilot of the airliner was in doubt whether to comply with Belorussian ATC. MiG was airborne for 13 min but did not get closer to the airliner than some 40 km. When the flight was released from MSQ, MiG escorted the plane to the Lithuanian border at close distance.
This is backed up by the BBC interview of a passenger, who said that she saw a fighter jet far away before landing in MSQ, but close during MSQ-VNO flight. Can anyone comment if it is possible to see a fighter jet 40 km away?
(Unfortunately I cannot post URLs yet, but BBC News page entitled "Belarus Ryanair flight diverted: Passengers describe panic on board" has a video with interviews, see at 1:00 min)
A passenger interviewed by Lithuanian media said that there was no disruption on board prior to landing in Minsk.