TEHRAN (AFP/Reuters) - Iran will on Thursday (today) deliver to the UN atomic watchdog its much-awaited response to a Western-backed nuclear deal aimed at shipping abroad Tehrans low-enriched uranium, the Mehr news agency said. The report quoted an unnamed informed source as saying Iran proposes some modifications in the draft of the UN-brokered plan but has accepted the overall framework, in what will be Tehrans final response. According to an informed source in Vienna, Iran in its final response to the agency, while accepting the framework, will propose changes, Mehr said in its report on Wednesday. The head of Irans Atomic Energy Organization, Ali Akbar Salehi, did not directly confirm the Mehr report but said Soltanieh left Tehran for Vienna early on Wednesday. He will meet with Mr ElBaradei at the first appropriate opportunity and present what he received in Tehran, Salehi told Reuters. A top aide of US President Barack Obama, meanwhile, indicated Washington would push for new sanctions against Tehran if it faltered on its commitments regarding its nuclear programme. But a top Moscow official, whose country has veto power in the UN Security Council, said this was unlikely in the near future. Mehr said Tehrans envoy to the International Atomic Energy Agency, Ali Asghar Soltaniheh, will meet IAEA chief Mohamed ElBaradei in the Austrian capital on Thursday and give Irans response to the Vienna talks. The IAEA brokered the deal during the Vienna talks earlier this month, which envisages Iran shipping out its low-enriched uranium (LEU) abroad for converting into fuel for a Tehran reactor. An influential Iranian lawmaker said the countrys Supreme National Security Council (SNSC) the top national security decision-making body will (later Wednesday) put the finishing touches to Tehrans official response. The council will decide on Wednesday its position about the response to the agencys proposal on supply of fuel to Tehran reactor, Alaeddin Borujerdi told the ISNA news agency. Borujerdi, head of parliaments committee on national security and foreign policy, advocates that Irans LEU be sent abroad gradually and not all in one shot. Irans ISNA news agency quoted a senior lawmaker, Mohammad Karamirad, as also saying Iran would present its position on the fuel plan on Thursday (today). Senior lawmakers have said Iran should import foreign nuclear fuel rather than send abroad by the end of this year much of its own LEU stock a crucial strategic asset in talks with world powers as the proposal stipulates. The United States is prepared to respond if Iran does not abide by its commitments over the controversial nuclear programme, a top aide to Obama said. Nothing is off the table, National Security Adviser James Jones said on Tuesday, raising the possibility that Washington could go for new sanctions if current diplomatic efforts fail. But Sergei Prikhodko, a top aide to Russian President Dmitry Medvedev, said on Wednesday that further sanctions are unlikely in the near future. Moscow has been indicating in recent weeks it could support Washington on sanctions against Tehran if diplomatic efforts failed. Kremlins top foreign policy aide said on Wednesday sanctions against Iran were highly unlikely in the near future, Interfax news agency reported. Sanctions in relation to Iran are hardly possible in the near future, Kremlin foreign policy aide Sergei Prikhodko said. There was no immediate comment from the IAEA in Vienna, but a diplomat close to the IAEA said the inspectors would return to Vienna on Thursday.