The U.S., Russia and France have replied to a proposal by Iran to swap some of its enriched uranium for reactor fuel, effectively dismissing the idea hours before an expected U.N. Security Council vote Wednesday on new sanctions against Iran, diplomats said. Three diplomats familiar with the replies say they contain a series of questions that in effect stall any negotiations on the issue. The U.S., Russia and France have said the swap proposal negotiated by Brazil and Turkey would leave Iran with enough material to make a nuclear weapon. And they note that Iran intends to continue a new program of enriching uranium to a higher level. The diplomats spoke to the AP on condition of anonymity because their information was confidential.