The maths are not completely adding up.
The "rumours are"
Disruption on board the flight, allegedly several Russian / Belarusian special forces created some safety concern with the cabin crew. Note these people did not continue the flight from Belarus to VNO after the Ryanair flight was released.
Bomb threat procedure (SOP) would NOT have been to have divert to a country "outside" the EU - that is ruled by an unstable mental leader Lukashenko, who has complete disregard for human rights, free speech or any freedom that does not present him as the "great" leader he himself perceives himself to be. In addition VNO airport was much closer then Minsk, so again diverting to Minsk would NOT have been SOP.
Furthermore any CREDIBLE Bomb threats should follow certain procedures and a certain "chain of command"
A Commander, unless he has seen a "bomb device" with his own eyes, and has some knowledge of explosive devices, is not the one who makes these decisions, if it is a credible "bomb threat" or not.
The only way the RYR flight can defend diverting to Minsk, would be that it was forced to change course due to an aggressive interception. The current Ryanair press release does not reflect any current information of this yet. I would assume they would be trying to keep this information confidential as long as they are able.
At what moment did the MIG show up? How many MIG's did show up. 2 - 3 more minutes straight ahead, and they would have been in Lithuanian airspace.
This was a hijack by air.
Unfortunately we do have similar "precedence" within Europe, when the airplane of the Bolivian president Evo Morales was forced to land in Vienna, as they believed Snowden was onboard.
That was both a forced diversion and search of the aircraft by the Austrian authorities. If they in fact was searching for Snowden, his life would / could have been in danger if he had been returned to the USA.
Then again Snowden was on the "right side" and if found should have been protected regardless. But we will never know what would have happen if he had been found.