NASA and Axiom Space have decided to delay the upcoming Axiom-4 launch to the International Space Station (ISS) indefinitely due to growing concerns over a persistent air leak in the Russian PrK vestibule of the aging Zvezda module.

An ongoing leak on the Russian side of the International Space Station has prompted an indefinite postponement of a planned human spaceflight from Kennedy Space Center, according to NASA.

NASA wants to evaluate recent efforts to stop a small but persistent air leak in the Russian segment of the space station.