... The idea is to have a Russian Soyuz spacecraft undock so its three-man crew can photograph the station from a distance, showing the completed lab complex with the shuttle attached, along with Russian, European and Japanese cargo ships and crew capsules. Discovery's mission represents the last time a shuttle and all current types of visiting spacecraft will be present at the station before the shuttle fleet is retired later this year. ...
Last time they tried this was with Mir, and a computer malfunction could have caused a disaster. Russia may not agree with the idea.