Russian President Dmitry Medvedev on Wednesday reprimanded the space agency chief and fired two top space officials after a launch failure caused Russia to delay the deployment of its own navigation system. This month's failed launch of three Glonass-M orbiters marked a humiliating setback to the country's efforts to introduce a global rival to the US Global Positioning System (GPS). A presidential statement said the officials had been fired for the mistakes made in the fuel calculations. The Russian Proton-M rocket failed to reach its initial orbit during the December 5 launch, causing it to dump the three high-tech Glonass-M satellites near the Hawaii Islands.