German authorities have issued an arrest warrant for a Ukrainian man suspected of being involved in the dramatic explosion that destroyed the Nord Stream gas pipelines in the Baltic Sea. The suspect, a diving instructor known only as Volodymyr Z, is believed to have played a key role in the attack, which crippled the pipelines running from Russia to Germany in September 2022.

Volodymyr Z is accused of diving 80 meters deep to the seabed at night to plant explosive devices on the pipeline...