Reading the question about which modules of the ISS are provided by which partner and in light of the discussion about the future of the ISS the following question came to my mind.
From a technical standpoint, would it be possible to split the ISS into two fully functional space stations? That is, decouple (for example) the Russian segment from the US segment and replace the missing functionality of each segment by new modules.
And if possible, would it be economically more efficient than building two completely new space stations (e.g. one US, one Russian) that fulfill the same tasks as the ISS today?
Note: Of course, on a higher level the ISS is more than the combination of its segments and the collaboration between the different nations is the biggest achievement itself, but I am more interested in the technical aspects here.