The GLONASS system will have 24 satellites when completed this year.
A Russian Proton-M rocket was launched into space on December 25 with three new satellites for Moscow's GLONASS navigation system, aimed at competing with US and European systems.
The satellites were placed into orbit after the rocket blasted off from Russia's Baikonur launch pad in Kazakhstan at 1043 GMT, a Russian space agency spokesman said, according to Interfax news agency.
The 1.4-tonne satellites join 17 others that are part of the GLONASS system, which Russia aims to finish next year. When completed, it will have a total of 24 satellites. GLONASS was developed by the Russian military in the 1980s to compete with the US Global Positioning System (GPS) and Europe's Galileo.
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