US President Joe Biden's administration on Wednesday waived sanctions against Nord Stream 2, the Russian-controlled builder of a Russia-Germany gas pipeline, which Washington had earlier said was a geopolitical security risk. Secretary of State Antony Blinken said in a letter to Congress that waiving the original sanctions set for Swiss-based Nord Stream 2 AG, and its chief executive Matthias Warnig, "is in the national interests of the United States." pmh/ft