President Barack Obama rejected criticism from Republicans over foreign policy, particularly his handling of Iran's nuclear ambitions, according to an interview extract released Wednesday.

"I have made myself clear since I began running for the presidency that we will take every step available to prevent Iran from obtaining a nuclear weapon," Democrat Obama told Time Magazine.

"Can we guarantee that Iran takes the smarter path? No, which is why I've repeatedly said we dont take any options off the table in preventing them from getting a nuclear weapon."

The US president said the Republicans seeking to replace him, including the frontrunner Mitt Romney, were attempting to win backing from the party faithful and secure the nomination by attacking his foreign policy decisions.

"I think Mr Romney and the rest of the Republican field are going to be playing to their base until the primary season is over," Obama said during a White House interview that will appear in Time's January 30 issue.

"Overall, I think it's going to be pretty hard to argue that we have not executed a strategy over the last three years that has put America in a stronger position than it was than when I came into office," he added.

The US president will bid for a second term in a November 6 election.

Romney said on January 1 that Obama had failed in his efforts to get Iran to abandon its suspect nuclear program.

"I want to make sure that the people of this nation understand that he failed us not only here at home, he's failed us in dealing with the greatest threat we face, which comes from Iran," Romney said.

The West alleges Tehran is seeking to acquire a weapons capability under the guise of its nuclear research program. Iran denies any such ambition and says its work is only for civil energy and medical purposes.

In the Time interview, Obama also contrasted his tenure with that of his predecessor, the Republican president George W. Bush, who led the United States into expensive wars in Afghanistan and Iraq.

"It's a US leadership that recognizes our limits in terms of resources and capacity," Obama said of his foreign policy decisions.

"And yet, what I think we've been able to establish is a clear belief among other nations that the United States continues to be the one indispensable nation in tackling major international problems."

EU to sanction Iran bank, Greece holds up oil embargo
Brussels (AFP) Jan 19, 2012 - EU nations Thursday agreed to sanction Iran's central bank, freezing assets used to finance its nuclear drive, but have yet to clinch an oil embargo deal that could penalise debt-hit Greece.

"The text was considered closed and agreed," a diplomatic source said of the proposed financial sanctions, following talks between senior diplomats from the 27 European Union nations.

Diplomats have held lengthy meetings through the week in Brussels to agree an oil and financial embargo against Tehran that is to be formally adopted at talks between EU foreign ministers on Monday.

But Greek concerns held up a final deal on the oil embargo.

The freeze on assets held by Tehran's central bank will be partial, "enabling legitimate trade to go ahead", and ensure there are no obstacles to continued payment of outstanding Iranian debts to Europe, an EU diplomat said.

Germany notably expressed concern over the reimbursement of loans to Iran worth 2.6 billion euros should financial channels be closed.

"The idea is to dry up sources of finance for Iran's nuclear programme," said the source, who spoke on condition of anonymity.

But the high-level diplomats planning ways of tightening the noose on Tehran were unable to finesse last details on an oil embargo, the source added.

"They'll have another go on Monday morning" ahead of the foreign ministers' meeting, said another diplomat.

"But it's looking likely that the oil embargo will have to go directly to the foreign affairs council" of ministers, he added.

The new EU sanctions are part of a concerted effort with the United States to pressure Iran into halting its controversial nuclear activities, which the West suspects are aimed at developing nuclear weapons.

Iran says its nuclear programme is purely for civilian use.

The EU imported some 600,000 barrels of Iranian oil per day last year, according to the International Energy Agency, making it a key market alongside China, which has refused to bow to pressure from Washington, and India.

"The issue is how to reassure the delegation that depends most on Iranian oil that all is done to protect them," said a diplomat.

"The problem with Greece was not resolved."

Iranian oil accounted for 34.2 percent of Greece's total oil imports, 14.9 percent of Spain's and 12.4 percent of Italy's in the first nine months of last year, according to the latest EU statistics.

The problem for European governments has been to agree to implement an embargo that gives nations dependent on deliveries from Tehran time to phase out existing contracts.

Some countries, including Britain, France and Germany, wanted a three-month deadline, whereas financially-stressed nations such as Greece, Italy and Spain were requesting up to a year.

Under discussion too has been a request from Italy to allow Iranian companies to continue repaying debts with crude instead of cash.

That would mean Tehran having less crude to sell on the market.

Exploratory talks have also taken place to seek alternative supplies for nations dependent on imports from Tehran.

Contacts had been made "notably with Saudi Arabia to examine whether it could increase production to offset the loss of Iranian crude," a senior EU official said.

Saudi Oil Minister Ali al-Naimi said this week that the kingdom's output could be boosted by around 2.6 million barrels a day to offset a potential cut in Iranian exports.

But Iran warned Saudi Arabia to reconsider its vow to make up for any shortfall.