Let me guess… Boeing involved in it somehow?

My money will always be on NASA.

The air volume lost each day is measured in kilograms in this article. That’s difficult for a non engineer to visualize. Is that enough to matter for air quality or pressure change? How do they introduce air into the closed system of the Russian section to replace what is leaking? Do they have to bring up pressurized air from Earth, then recycle that as long as they can?