BLUF: NASA's contract with the Russian Space Agency for joint US/Russian human space flight activities has reached $4,682,328,998.90 in cumulative obligations, with a period of performance now extending through December 31, 2028.

The contract, numbered NAS1510110, was originally signed December 16, 1993, and is administered by NASA Johnson Space Center. Its base-and-all-options ceiling stands at $4,707,093,968, according to award data retrieved directly from USAspending.gov.

Why it matters: This is one of the longest-running federal contract vehicles in the space sector, predating the International Space Station's 1998 first launch by five years. Its period of performance now runs through the end of 2028, keeping it active deep into the ISS's currently planned operational life, and its continued funding reflects the ongoing US-Russia operational relationship on crewed spaceflight even as broader bilateral relations have shifted over the contract's three-decade life. For contractors tracking NASA's human spaceflight budget lines, the vehicle is a data point on how legacy international-partner agreements persist alongside newer commercial programs like the Human Landing System.

By the numbers:

• Cumulative obligations: $4,682,328,998.90
• Base-and-all-options ceiling: $4,707,093,968
• Original signature date: December 16, 1993
• Current period of performance end date: December 31, 2028
• NAICS: 481212 (Nonscheduled Chartered Freight Air Transportation)
• Product/service code: J018 (Maintenance/Repair/Rebuild of Equipment — Space Vehicles)
• Contracting office: NASA Johnson Space Center

The most recent transaction on the award, dated August 5, 2026, was a $0 administrative modification (number 396). The most recent transaction carrying new obligated funds was a supplemental agreement for work within scope dated June 30, 2026, which obligated $251. Per USAspending's contract data, the award was not competed and carries no small-business set-aside, consistent with its status as a government-to-government agreement rather than a standard competitive procurement.

Source: USAspending.gov