KLD - or Kaliningrad Avia had a similar concept, but linking european cities to CIS cities using 737-300s.
Open skies and Visa free for Kaliningrad region was under discussion for well over a decade now - a centre where CIS and EU nationals could meet for business.
Alas KLD failed as the home market is tiny, and the transit passengers were hopelessly low yielding. Air Baltic used to operate Fokker 50's from their own little terminal in Kaliningrad airport - attempting to link the city to their network.