. . "Group of Five plus one" . "P5" . "the U.S.'s negotiating partners" . "EU3+3" . "the U.S. and other world powers" . . "the U.S. and other major world powers" . "only non-UNSC nation that signed" . "Iran and other world powers" . . "P5+1/EU3+3" . . "five permanent Security Council members plus Germany" . "P5+1" . . "P5+1 countries" . "P5 +1 Group" . "U.S. and other global powers" . "P5 + 1" . "the United States, Iran, and five other world powers" . . "P5+1" . .