Russian Progress M-20M Cargo Ship Docked with ISS

This image provided by NASA taken by one of the crew members aboard the International Space Station photographed this night view of storm clouds over Southern California July 21, 2013. 

Early morning lightning can be seen as a white blotch just to the right of center. 

The yellow colored area, beneath the grey clouds, which almost shines because of night lights, is part of the highly populated area of Los Angeles and San Diego. (AP Photo/NASA)

Russia's space agency says that its cargo ship has docked successfully with the International Space Station.

Roscosmos says the unmanned Progress M-20M spacecraft moored at the station Sunday about six hours after its launch from the Baikonur Cosmodrome in Kazakhstan. The docking was performed in automatic mode.

The agency says the ship has delivered about 2.4 metric tons of supplies to the space outpost, including fuel, food, water and scientific equipment.

The 2011 retirement of the U.S. shuttle fleet has left Russia's Soyuz spacecraft as the sole means to ferry crews to and from the space outpost. The unmanned cargo version of the Soyuz, the Progress, delivers the bulk of station supplies.