Iran says “Yes” to deal. Where is CNN?

Iran has said that it would do a trade of nuclear material on it’s own territory. Obama and the west do not want this. Why. Why would they insist that the deal of a trade of nuclear fuel would only be acceptable if Iran’s fuel is shipped out to Russia or some other country? What could possibly be wrong with doing the exchange on Iran’s ground? If there are technical reasons why this is not possible then let’s hear them. Instead….we just hear Obama say “I’m hoping they will come through that door and sign the deal that we have proposed”……otherwise there will be consequences.
It makes you think that the USA does not want Iran to do the exchange on it’s own territory because the USA or Russia had no intentions of shipping back the reprocessed fuel. By doing the trade in Iran, they would not be able to hold up the supply. If there is any other possible explanation for America and the west turning down this offer then let’s here it. Why is CNN and BBC “Not” asking this important question? Where are they?