Answer: Russia
Notes: Nauka, also known as the Multipurpose Laboratory Module-Upgrade (MLM), serves as the primary laboratory in the Russian Orbital Segment of the International Space Station. It is utilized for experiments, the storage of scientific instruments, and can function as a backup service module for the ISS. Its name, "Nauka," means "science" in Russian. Recently, a coolant leak originated from external backup radiator circuit of the Nauka module.
