There is no fixed percentage of ownership for the entire space station. On the contrary, Article 5 of the IGA provides that each partner retains jurisdiction and control over the items it records and on the personnel in or on the space station that are its nationals.  Therefore, for each ISS module, only one partner retains exclusive ownership. However, agreements on the use of space stations are more complex. The station consists of two sides: the Russian orbital segment (ROS) and the orbital segment of the U.S. (USOS).  A third layer consists of contractual agreements traded or exchanges of rights and obligations of partners, including the 2005 framework agreement between NASA and Roscosmos, which defines the conditions under which NASA acquires seats on Soyuz carriers and cargo capabilities on unmanned progress carriers. At the end of 2011, the Gateway Platform Exploration concept also proposed to use the remaining USOS and Zvezda 2 as a fuel depot and gas station at one of the Earth-Moon Lagrange points. However, the entire USOS was not designed for dismantling and is rejected.  The common philosophy of this approach is that goods and services are exchanged by space agencies without exchange of funds.
The exchange system has significantly reduced technical and financial risks and supported the standardization and community process in the space station program. The terms of an exchange or sale are defined on a case-by-case basis by the parties to the transaction and must respect the overall legal framework of the space station. Four MoUs between the National Aeronautics and Space Administration (NASA) and each cooperative space agency: the European Space Agency (ESA), the Canadian Space Agency (CSA), the Russian Federal Space Agency (Roscosmos) and the Japan Aerospace Exploration Agency (JAXA). A fourth legal level of agreements continues to implement and complement the four agreements. These include the ISS Code of Conduct, which establishes criminal justice, anti-harassment and certain other rules of conduct for ISS crew members.  in 1998. 2 The cooperating agencies cooperate with the space station in accordance with the relevant provisions of this agreement, the respective Memorandums of Understanding between NASA and CSA, NASA and ESA, NASA and the Government of Japan, as well as NASA and AGENCE FOR THE INTERNATIONAL Civil Space Station, as well as agreements between NASA and other agencies that cooperated in the implementation of the agreements.