NASA and the European Space Agency (ESA) are aiming to cooperate on all manner of robotic orbiters, landers and exploration devices for a future trip to Mars.
Specifically, NASA and ESA recently agreed to consider the establishment of a new joint initiative to define and implement their scientific, programmatic, and technological goals for the exploration of Mars. The program would focus on several launch opportunities with landers and orbiters conducting astrobiological, geological, geophysical, climatological, and other high-priority investigations and aiming at returning samples from Mars in the mid-2020s.