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The dispute is about a small yet persistent leak in the vestibule of the Zvezda service module called PrK, which separates a docking port from the rest of the module.

Leaks are affecting a key part of the International Space Station. NASA and Russia’s space agency, Roscosmos, are not seeing eye to eye about the level of risk.

The multinational effort to assemble the station was a huge success, and the ISS has avoided any major incidents thanks to careful management and maintenance. But it is getting old, and the cracks are beginning to show—literally.