Four years after the attacks, Serhii K will appear in court accused of a plot to destroy Russia's gas pipelines to Germany. Four years after the dramatic operation that targeted the two gas pipelines connecting Russia to Germany under the Baltic Sea, the first trial is opening Wednesday in Hamburg against Serhii Kuznietsov, one of the alleged masterminds. Key points and original sources are listed below.

• Four years after the attacks, Serhii K will appear in court accused of a plot to destroy Russia's gas pipelines to Germany.S1

• Four years after the dramatic operation that targeted the two gas pipelines connecting Russia to Germany under the Baltic Sea, the first trial is opening Wednesday in Hamburg against Serhii Kuznietsov, one of the alleged masterminds.S2