MOSCOW (AP) - U.S. scientist Gregory Olsen and a two-man Russian-American crew made final preparations to leave the international space station Monday, ending a seven-day trip for the millionaire businessman as the third private citizen to visit the orbiting outpost.

After the incoming crew formally takes over command of the station, Olsen, cosmonaut Sergei Krikalev and astronaut John Phillips will climb into a Soyuz capsule, undock from the station and begin the fiery, 3 1/2-hour descent en route to a landing on Kazakhstan's barren steppe.

The three will spend two hours undergoing medical checks following landing, then be flown by helicopter to a Kazakh staging point and ultimately back to Moscow for further examinations.

Krikalev and Phillips have inhabited the station since April, during which time Krikalev passed the mark of 800 cumulative days in space - breaking the previous record of 748 days set in the late 1990s by cosmonaut Sergei Avdeyev over three missions.

Krikalev spent two long stints aboard Russia's Mir station, and flew twice on NASA's space shuttles. He was also part of the international space station's first crew nearly five years ago.

Astronaut William McArthur and cosmonaut Valery Tokarev will spend six months on the station, during which time they will conduct at least two spacewalks, as well as scientific experiments, medical checks and routine maintenance.

The next cargo shipment that McArthur and Tokarev can expect will be a Russian Progress ship, scheduled to reach the station in December.

Russian media reported Monday that the botched launch of a costly, state-of-the-art European satellite, coinciding with Russia's failure to recover an experimental space vehicle after its blast-off, have dented the reputation of Russia's space program and jeopardized its hopes of earning foreign cash.

The loss of the CryoSat satellite due to the failure of a Russian Rokot booster dealt a major blow to the European Space Agency, which had hoped to conduct a three-year mapping of polar sea ice and provide more reliable data for the study of global warming.

Russia's Khrunichev company, which built the booster, apologized for the loss of the estimated $210 million CryoSat.

"Moscow's space ambitions have sunk in the Arctic Ocean,'' the daily Nezavisimaya Gazeta commented.