The sabotage in September of the Nord Stream pipelines carrying Russian gas to Europe has become one of the central mysteries of the war in Ukraine, prompting months of finger-pointing and guesswork.

Now, new intelligence reporting has provided the first significant known lead about who was responsible.

Guest: Julian E. Barnes, a national security correspondent for The New York Times.

Background reading: 

• Officials say there are still enormous gaps in what American spy agencies and their European partners know about the detonations.
• The Baltic seabed provided a nearly ideal crime scene.

For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.

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