The environmentalist group Greenpeace has again disrupted efforts by the Russian state-owned energy giant Gazprom to drill for oil in the Arctic. On Monday, Greenpeace activists held up a ship ferrying workers to Gazprom’s Arctic drilling site by attaching themselves to the ship’s anchor chain. Gazprom is set to become the first company to produce Arctic oil through drilling operations in the Pechora Sea. On Friday, six Greenpeace activists boarded Gazprom’s main oil rig and occupied it for several hours.