The U.S. and Iran are holding indirect talks on Tuesday in what could be the first step toward reviving the 2015 deal that constrains Tehran's nuclear facilities in exchange for sanctions relief.

The meetings, hosted by the European Union, will work toward two separate agreements - on how the U.S. and Iran can both return to compliance with the deal's terms.

Former President Donald Trump withdrew from the accord in 2018, re-imposing strict U.S. sanctions on Iran's economy slotxo download and government. In response, the Iranian government began violating the restrictions on its nuclear program, now enriching more uranium, at higher levels, and with more - and more advanced - centrifuges.

While both sides have downplayed Tuesday's meetings, it could mark the beginning of a quick return to the deal, which saw Iran agree to international inspections of and certain time-limited restrictions on its nuclear program. In exchange, sanctions were lifted by the United Nations, the U.S., and the other world powers who signed on - the United Kingdom, France, Germany, Russia and China.

But especially amid fierce pressure in Washington and from regional allies like Israel, a renewed nuclear deal would still leave a long road ahead for the Biden administration, which seeks to "lengthen and strengthen" the original agreement, including by addressing Iran's support for proxy forces. across the region and its ballistic missile program.

"We don't underestimate the scale of the challenges ahead. These are early days. We don't anticipate an early or immediate breakthrough," State Department spokesperson Ned Price said Monday - before calling the indirect talks a "healthy step forward. "

U.S. special envoy for Iran Rob Malley will lead the delegation, which will meet with European, Chinese and Russian counterparts. Iran's delegation will have its own separate meetings with those teams, which together constitute the remaining members of the agreement.