The U.S. national zoo said Wednesday it will welcome a new pair of giant pandas from China, six months after Americans bid a fond farewell to three of the rare black-and-white bear species. China will send two 2-year-old giant pandas, Bao Li and Qing Bao, to Washington by the end of this year, according to an announcement by the Smithsonian’s National Zoo and Conservation Biology Institute. The gesture comes at a time when relations between the two countries remain fraught with tensions. A light-hearted video unveiling the new pair’s planned arrival featured first lady Jill Biden, who said she…