Flying regularly from either Moscow or anywhere in central Europe to the Emirates or back is not the right application for any LearJet. But, hey, you gotta start somewhere, don't you?
Nothing wrong with starting off with an airplane which is suitable for 75-80 % of your trips and then stepping up as time goes by. Better this way than the other way around.
Have you ever considered a late s/n Falcon 20 with TFE731s? They offer great value, excellent short field performance, speed and range. If I'm not mistaken, the ones equipped with the TFE731 will make 2,500 NM.
They must be cheap to buy, type rating courses are being done either in DFW or LBG, but there are not many of them around any longer, so finding experienced pilots and mechanics might be a challenge...