VIENNA (AP) - U.S. officials are urging Iran to return to negotiations about its nuclear program.
Talks reached a stalemate months ago, after Iran tried to re-negotiate an agreement for it to ship out most of its low enriched uranium to be turned into fuel for a research reactor.
U.S. Secretary Steven Chu said Tuesday that Washington is "always interested in re-engaging Iran" on the fuel swap but wants to make sure Iran is sincere.
U.S. Deputy Energy Secretary Daniel Poneman said it was important to focus on larger talks between Iran and the five U.N. Security Council members plus Germany, beyond the narrower talks on the fuel swap.
Iran says it's enriching to produce energy. The U.S. and other countries fear Iran could use the process to make weapons.