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From there, they could, if they want, be turned over with their case to swiss justice authorities, afaik.
True - but the airline didn't have a rep office there. Swiss/Lufthansa mainly operate from a few airports in Switzerland, Germany, the USA and a few Asian countries - so why not fly that extra 1,5 hours and have a solution that they already know will work, rather than having to figure out everything new in Warsaw? Confucius used to say: "The longest ways are unknown shortcuts" - and I guess that's how they saw it, too.
why did the airline decide to return to Zurich; instead to continue for another 4 hours 40 minutes...to Beijing...
This question is much more interesting and I guess we can only speculate for the reasons behind. Most likely, the captain was afraid that the two guys might get even angrier and that an emergency landing would be required. However, there are very few airports between moscow and beijing in siberia, so it would take much more time to land anywhere safely.
It's generally very normal that planes return to their home airport if possible when such incidents occure - for "administrative reasons", as the carriers usually claim.
I did some research on the topic and it appears that this is an official order since the 9/11 attacks in 2011 that airplanes must return on land immediately in case of such incidents, as they might be high-jacking attempts. It's another of those "terrorism prevention rules" by the international Aeronautics Association IATA, just like the stupid rule that you can't bring any drinks to the aircraft