article_snippet.sent: The biggest enforcement provision in preliminary nuclear agreement with the Islamic Republic is turning into one of the mostly hotly contested elements, however.
article_snippet.sent: And the debate barely involves Iran.
article_snippet.sent: That's not the position of U.S. and other negotiators, a major issue that still must be worked out.
article_snippet.sent: The disagreement on this issue is between the U.S. and U.S. European allies on one side, and Russia and China on the other - all countries involved in the nuclear negotiations.
article_snippet.sent: Normally in that body, any one of the five permanent members - the U.S., Britain, France, Russia and China, which are all party to Iran Iran negotiations - can veto resolutions.
article_snippet.sent: But many questions remain, including what would happen if two or more countries object.
article_snippet.sent: Russia and China have traditionally opposed almost all U.N. sanctions measures, and, perhaps tellingly, neither country's foreign minister was present when the April 2 framework was unveiled.