European natural gas prices fell again on Monday and weighed down those in Asia as pipeline imports increased and the market gained more clarity on when exactly Russia’s Nord Stream 2 (NS2) pipeline might start operations. 

Norwegian supplies climbed upward Monday as more capacity returned from the Troll Field, where maintenance has limited volumes. Construction on the last stretch of NS2 is likely to run through at least Sept. 12, according to a notice from the German Federal Maritime and Hydrographic Agency. Russian President Vladimir Putin said Friday that there’s roughly nine miles of underwater pipeline left to be completed. 

European natural gas prices, which have set records this summer amid low supplies and storage inventories, dropped 11% last week after Gazprom...