It would seem so, as that would be a situation which threatens the safety of the aircraft, which is a pretty good definition of an emergency. I've not gone thr

It would seem so, as that would be a situation which threatens the safety of the aircraft, which is a pretty good definition of an emergency. I've not gone through the detail yet, but depending on altitude of the aircraft at the time of the alert, and its speed, continuing onward to Lithuania may have made more sense for the crew - if they were at or near cruising altitude, you're talking about (say) 100 nm of lateral distance to execute the descent (for a normal descent profile). Under normal circumstances, you would be unlikely to want to divert to a new airport for this emergency landing, unless there was an issue like poor visibility or very limited emergency services at your destination - since diverting would likely require new descent and approach calculation and routing and briefing.