They generally say there is rarely anything new under the sun and this idea was proposed back
here. There is likely even some discussion on it in the thread.
as to "
The USA has also claimed they want to return to the moon. However, the space shuttle program seems to be seriously in trouble (intended launch of the space shuttle at 1-st of july has been procrasted again, and some claim that the space shuttle program has come to an end)." Why is this a threat, or problem for the new US Lunar missions? They are planned to be done using the new CEV after the Shuttles are retired. If anything, an early demise of the Shuttle is likely to result in the schedule for the CEV to be brought forward to help complete the ISS.