30.09.22
The Germans were warned in summer by the CIA about a possible attack scenario on the Nord Stream pipelines. U.S. intelligence claimed to have intercepted Russian communications in which concerns were expressed about possible Ukrainian attacks on Western infrastructure. The Ukrainians allegedly tried to rent a boat in Sweden for this purpose. The CIA did not consider the scenario of a Ukrainian attack to be very credible, but the mere fact that the possibility of an attack on Western infrastructure was mentioned by the Russian side prompted the Americans to warn the Germans about the scenario.
https://www.spiegel.de/international/sabotage-in-the-baltic-nord-stream-attacks-expose-vulnerability-of-european-infrastructure-a-03337f93-a32a-40a1-9266-fc2692289e33