Tehran has agreed to send its low-processed uranium to Turkey in exchange of higher grade uranium but the United States said moves for toughened sanctions would still go ahead.The breakthrough reached after several hours of intense negotiations of Iranian President Mahmoud Ahmadinejad, Brazilian President Brazilian President Lula da Silva and Turkish Prime Minister Recep Tayyip Erdogan in Tehran on the side lines of G 15 summit. Under the agreement Iran will send some 1200 kilograms of its 3.5 percent enriched uranium over to Turkey in exchange for 20 percent Uranium. The Turkish Foreign Minister Ahmet Davutoglu told reports after the trilateral meeting of three presidents that after this agreement, now there is no ground for any sanctions. The Brazilian foreign minister Celso Amorimtold told on the occasion that this showed that dialogue and diplomacy were the only routes to resolve contentious issues. Meanwhile white House spokesman Robert Gibbs said it does not change the steps that we are taking to hold Iran responsible for its obligations, including sanctions. In a statement, he also expressed serious concerns about the deal and said if Tehran lived up to the new pact it would represent some progress.