Not sure they could even if they wanted to. Another of the modules in the Russian segment is showing stress fractures. Meaning that the lifespans in that segment which is critical to the ISS as a whole is nearing end of life.And...Russia cannot move their own modules from ISS to another station due to the inclination differences planned. The hullabaloo over Russia threatening to pull their modules to create their own station turns out to be little more than noise it seems. You have to wonder why Nauka was launched then. After all, Russia could have saved it for the new station.