Buran system had designs for that - one of the components was a nuclear-powered space tug that could shift satellites around, reducing launcher limitations. Des

Buran system had designs for that - one of the components was a nuclear-powered space tug that could shift satellites around, reducing launcher limitations. Design planned for endurance of 100 "LEO->GEO" satellite moves. Hypothetical Hubble with support for such operation would have docking port for the space tug, which could bring it back to orbit that could be taken by service vessel, then bring it back to proper orbit.