Iran: Lift sanctions or no deal

(CNN)Iran will sign a final nuclear agreement only if economic sanctions against the nation are removed on the first day of the deal's implementation, President Hassan Rouhani said Thursday.

Ayatollah Ali Khamenei, the Islamic republic's supreme leader, meanwhile, told state-run media outlets he is neither in favor nor against the proposed deal because it isn't final, and he's not certain it will become binding because he has "never been optimistic about negotiations with the U.S."

Six world powers and Iran reached a preliminary deal last week that aims to limit Tehran's nuclear program in exchange for lifting economic sanctions.

The United States, however, has stressed that if a final deal is reached with Iran, the removal of any sanctions will come in phases.

But work on the agreement isn't finished.

Negotiators from Iran and the United States, China, Germany, France, Britain and Russia have until June 30 to come up with a final deal.

Supreme leader speaks
Khamenei said he supports the negotiators, but in several not-so-subtle shots at the United States, noted it is too soon to celebrate the proposed deal.

"Everything lies in the details," Khamenei said in a Thursday address, according to Press TV. "The other side, which is known for backpedaling on its commitments, may want to corner our country when it comes to the specifics."

What has been hashed out so far is no guarantee that the deal will become final, he said, and according to the Islamic Republic News Agency, the leader said he can't support or oppose the deal, especially when it's possible "the other disloyal party intends to limit our country."

Some have asked why Khamenei hasn't taken a position on the talks, and the reason is simple, he said, according to IRNA: "There is no need to take a position. Officials say nothing has been done yet and that nothing is binding. I am neither in favor nor against it."

Any final deal must "ensure the interests and dignity of the (Iranian) nation," he said, adding he will support an agreement that "will safeguard national interests and dignity." He said he'd rather see the agreement fail than make a deal that jeopardizes Iran's interests.

"What has happened so far will neither guarantee the agreement itself nor its content. It will not even guarantee completion of the negotiations. Therefore, it is meaningless to congratulate me or others about it," he said.

Uphill battle
Rouhani said his government would not surrender to bullying, sanctions and threats, according to Press TV.

"We will not sign any deal unless on the very first day of its implementation all economic sanctions against Iran are lifted all at once," Rouhani said at a ceremony to mark National Nuclear Technology Day in Tehran.

President Barack Obama faces an uphill battle selling the deal to a skeptical Congress, which has threatened to impose new sanctions on Iran.