They would end up landing in Russia; with tensions between Russia and the west rising (i.e. the US supplying weapons to the country Russia is at war with at the moment), this isn't ideal.
I mean it's an option for sure and in case of emergency it won't really matter whose return pods they use, but it seems they prefer not to.
Seems a bit of a ground control trust issue given there are 2 Russians up there at the moment, I wonder how they are intended to return at a future date.
Russian cosmonauts already regularly fly on SpaceX missions [1], and Americans also regularly fly on Soyuz missions. [2] The entire point of science cooperation, sports, and the like is to rise above politics.
