Because they didn't . The spittle mouthed schnitzel swallowing blockheads were still buying russky oil right up until the folks controlling biden carried out an act of war on Germany and blew it up.
Germany freezes Nord Stream 2 gas project as Ukraine crisis deepens
Both pipelines were not supplying natural gas (not “oil”) because the Russians had shut off deliveries on their end by September 2022, in an attempt to pressure Germany as a retaliation for sanctions vs Russia.
There was gas in the pipeline and it bubbled out, but it was not flowing from the Russian end.