To clarify, the pipeline that goes through Ukraine is not owned by Gazprom. It's owned by the Ukrainian government and the Ukrainian transit systems. That is one of the advantages of it: The ability to manipulate it the way Gazprom manipulates Nord Stream 1 is not quite as apparent. Now, Russia can, of course, shut gas on and off at the border as it pleases.
On September 7th, 2022. See this statement in context.