Iran has the technical capacity to build a nuclear weapon but has not taken a decision to do so, an official told the Al Jazeera broadcaster on Sunday. Iran "has the technical ability to build a nuclear bomb" said Kamal Kharrazi, who heads an advisory board linked to Iran's leadership.

But Tehran has "not made a decision to build an atomic bomb," he added.

The comments come after U.S. President Joe Biden visited the Middle East this week and signed a security pact with Israel vowing to prevent Iran from acquiring nuclear weapons. It also comes as efforts to revive a 2015 nuclear deal between Tehran and world powers remain stalled.

Kharrazi, a former foreign minister, also told Al Jazeera that Tehran had carried out extensive drills to be able to strike deep inside Israel "if sensitive (Iranian) installations are targeted."

He did not specify when the drills took place.

The 2015 nuclear deal offered Iran sanctions relief in exchange for imposing limits on its nuclear program and sought to guarantee Tehran could not develop a nuclear weapon, something it has always denied wanting to do.

The United States withdrew from the agreement in 2018 under then-President Donald Trump and reimposed biting sanctions, prompting Tehran to step away from many of its own commitments under the deal.

Iran has held direct talks with remaining parties to the accord — and indirect talks with the United States — in a bid to restore the deal, but negotiations have been at an impasse since March.

The new security pact signed this week by Israel and the United States commits Washington to "never to allow Iran to acquire a nuclear weapon," stating that the U.S. "is prepared to use all elements of its national power to ensure that outcome."

Asked on Thursday how long the U.S. was prepared to give efforts to revive the 2015 nuclear deal, Mr. Biden said, "we're not going to wait forever."

Tehran earlier Sunday accused Washington of provoking tensions in the Middle East, after Biden vowed that the United States would not "tolerate efforts by any country to dominate another in the region through military buildups, incursions, and/or threats", in a transparent reference to Iran.

The International Atomic Energy Agency (IAEA) said earlier this month that Tehran had started "feeding... a cascade of... centrifuges" at a fuel enrichment plant.

The techniques facilitate the process and would make it easier for Iran to switch to a different level of enriching uranium.

In January 2021, Iran said it was enriching uranium to 20% at that facility, a level well beyond the 3.67 percent agreed under the 2015 deal, before later saying it had enriched to 60% at another facility, still short of the 90% required for military grade uranium, but a short technological step away from that level of enrichment.

"It's no secret that we have become a quasi-nuclear state. This is a fact. And it's no secret that we have the technical means to produce a nuclear bomb, but we don't want that, and there has been no decision to do that," Kharrazi told Al Jazeera. "In the past, and within just a few days, we were able to enrich uranium up to 60%, and we can easily produce 90% enriched uranium. But what we want is a Middle East without any nuclear weapons."

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