"Assembly of the Proton-M space rocket concluded in the Baikonur Cosmodrome assembly building 92-A50, which is to put the Russian-European ExoMars-2016 mission into orbit in mid-March," Roscosmos said on its website.
It said the launch was expected from Baikonur’s launch pad number 200 at 09:31 GMT on March 14.
Roscosmos noted that hard docking was performed with the spacecraft’s fourth stage, which includes a Briz-M booster and the ExoMars-2016 orbiter.
Preparations were also made for the carrier rocket to be transported to a fueling pad.
The European Space Agency and Roscosmos agreed to develop the ExoMars program in 2012 to investigate the atmosphere of Mars and explore signs of past life on the red planet.
Next week’s orbital probe launch is expected to be followed by a Mars rover probe in 2018.