Iran took additional steps away from its 2015 nuclear accord with world powers on Saturday, accelerating its nuclear activities after accusing European signatories to the deal of failing to provide a solution to the Trump administration's crippling oil sanctions.

"Europeans should know that there is not much time left," to save the agreement, Behrouz Kamalvandi, spokesman of the Atomic Energy Organization of Iran, said Saturday during a live news conference carried by state TV.

It marks the third time Iran has officially eroded compliance with the landmark agreement, which President Donald Trump withdrew the U.S. from last year.

Kamalvandi said Iran has begun injecting uranium gas into advanced centrifuges and that the country will no longer abide by the deal's limits on its nuclear research and development. He said Iran has the ability to go beyond 20% enrichment concentration of uranium, a level analysts say is a short step away from 90% enrichment – weapons-grade level. Iran already has already surpassed stockpile limits and enrichment levels set by the deal. Kamalvandi warned several times in his comments that Iran was rapidly approaching a point that would mean a full withdrawal from the deal.

"Our stockpile is quickly increasing, we hope they will come to their senses," he said.

The move had been expected for several days.

"The third step may not be striking in appearance, but it is of an extremely important nature, and will considerably accelerate the activities of the country’s nuclear energy organization," Iran's President Hassan Rouhani said in comments carried by state television on Wednesday, previewing the action.

"In my opinion, this step is the most important one that we will take, and its impacts will be extraordinarily huge," Rouhani said, adding that Iran would "immediately start (nuclear-related) research and development" prohibited by the terms of the deal

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Iran has vowed to reduce its commitments to the nuclear deal every 60 days until European powers find a way of compensating it for the U.S. sanctions. Iran exceeded the limits agreed under the accord on its stockpile of enriched uranium in July, when it also breached a cap on enrichment levels, raising them from 3.67 to 4.5%.

Even before Tehran's official announcement, a top Trump administration official blasted the anticipated move. "We believe this is nuclear extortion. Iran does not need to enrich fissile material to have a peaceful nuclear program," Brian Hook, the State Department’s special representative for Iran, told reporters on Wednesday.

Britain's foreign ministry described Iran's move as "deeply concerning."

Despite the move, Iran technically remains part of the accord.

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French President Emmanuel Macron has floated a proposal to give Iran a $15 billion line of credit if Tehran agrees to come back into full compliance with the nuclear agreement. The line of credit would be guaranteed by Iran’s oil revenues and would require the Trump administration to ease U.S. sanctions aimed at barring Iran from selling its oil, France’s foreign minister told reporters earlier this week.

But Trump administration officials flatly reject the possibility of easing sanctions on Iran.

The economic penalties are part of Trump’s "maximum pressure" campaign, aimed at strangling Iran’s economy and forcing its leaders into a new round of negotiations.

"We can’t make it any more clear that we are committed to this campaign of maximum pressure," Hook said. "We are not looking to grant any exceptions or waivers."

Indeed, the Trump administration is moving in the opposite direction – issuing new sanctions at a seemingly frenetic pace. On Wednesday, Hook said the U.S. would target what he called an "oil for terror" network of individuals, entities and vessels that he said Iran’s Revolutionary Guards Corps uses to illicitly sell its oil.

On Tuesday, the Trump administration sanctioned Iran’s space program. And last week, it blacklisted an Iranian oil tanker and its captain as it moved toward Syria.

"There will be more sanctions coming," Hook vowed.

He also unveiled a State Department initiative to offer up to $15 million to any individual who provides information that helps the U.S. disrupt operations of Iran’s Revolutionary Guards Corps. Hook confirmed the State Department offered millions of dollars to the captain of the oil tanker suspected of trying to move oil to Syria if the captain would sail the ship to an area where the U.S. could seize it.

The captain ignored the request, made by Hook in emails, first reported by the Financial Times. A tweet Friday with attached satellite imagery by National Security Advisor John Bolton appeared to show the ship – Adrian Darya 1 – was just a few miles off the coast of Syria. It was not clear if its oil cargo had been unloaded.

Separately, Iran said this week that it released seven crew members of a British-flagged oil tanker that it detained near its territorial waters in the Persian Gulf, according to a statement by the ship's Swedish owner, Stena Bulk CEO Erik Hanell.

Iran had seized the tanker in July, saying it violated Iranian laws.

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The hard line from Hook and others, such as Israel's Prime Minister Benjamin Netanyahu, who said Thursday that even more pressure needs to be put on Iran because of its "aggressive actions," contrasts with Trump’s own remarks.

During last month’s G-7 meetings in France, the president told reporters he was open to Macron’s line-of-credit proposal, though he emphasized that the U.S. would not be willing to contribute any money. "They may need some money to get them over a very rough patch. And if they do need money, certainly – and would be secured by oil, which means – it means great security. And they have a lot of oil," Trump said.

Trump has left the door open to possible talks with Iran's president on the sidelines of the United Nations' General Assembly in New York later this month, but Tehran has rejected any negotiations with Washington unless sanctions are dropped.

But Holly Dagres, an Iranian-American analyst and commentator on the Middle East, said that it's really difficult to understand what the Trump administration's Iran strategy is or what it's trying to achieve because of its consistently mixed messages.

"Trump seems to just want a photo-op and a two-page paper signed so he can show his supporters that he made good on his (campaign) promise that not only has he killed the Iran deal but he's talked to these guys and he's trying to make a better deal," she said, a reference to three theatrical summits Trump has held with North Korean leader Kim Jong Un as part of efforts to convince Pyongyang to abandon its nuclear program.

Dagres said for Iran to be drawn into talks it would want a concession from Trump – such as lifting sanctions – "not just something that comes out of his mouth."

Iran's President Hassan Rouhani speaks during a cabinet meeting in Tehran, on Sept. 4, 2019

This article originally appeared on USA TODAY: Iran warns time running out to save nuke deal as it reduces compliance