The secret operation that blew up the Nord Stream pipelines severed western Europe from the biggest source of Russian natural gas. While some in the West were quick to accuse Russia of sabotaging its own gas export route, German investigators identified a cell of Ukrainians they say were the alleged perpetrators. Key points and original sources are listed below.

• The secret operation that blew up the Nord Stream pipelines severed western Europe from the biggest source of Russian natural gas.S1

• While some in the West were quick to accuse Russia of sabotaging its own gas export route, German investigators identified a cell of Ukrainians they say were the alleged perpetrators.S2