Russia's ruptured undersea Nord Stream gas pipelines are set to be sealed up and mothballed as there are no immediate plans to repair or reactivate them, sources familiar with the plans have told Reuters. One Russian source said Moscow saw the project as "buried." Two others said that, while there was no plan to repair the ruptured pipelines, they would at least be conserved for possible reactivation in the future. Investigations into explosions that damaged the pipelines last year are ongoing, and it remains unclear when they will conclude, the Danish, Swedish, and German foreign ministries said last month. To read the original story by Reuters, click here.