It was Russia that stopped delivering gas through the pipeline. It was already non-functioning when it was blown up, the gas inside was static, non-moving, the pressure only kept up to prevent pipe-deterioration. That was unilateral, there were no sanctions, and Russia refused to take delivery of parts they had claimed they needed.
Even before the war, the German subsidiary of Gazprom had already started deliberately lowering the amount of gas stored underground in Germany, at a time when it was usually being filled up for the next winter.
Even before the war, the German subsidiary of Gazprom had already started deliberately lowering the amount of gas stored underground in Germany, at a time when it was usually being filled up for the next winter.
Examples, there are many articles from around that time: https://www.dw.com/en/eu-gas-russia-nord-stream-crisis/a-666... (it shows the timeline, the explosions were inconsequential, gas had already long stopped flowing)
September 2022: "Russia cuts off gas exports to Europe via Nord Stream indefinitely"-- https://edition.cnn.com/2022/09/02/energy/nord-stream-1-pipe...
August 2022: "Nord Stream 1: Russia switches off gas pipeline citing maintenance" -- https://www.theguardian.com/business/2022/aug/31/nord-stream...