As fragile nuclear negotiations between Tehran and Washington teeter on the edge, explosive new satellite imagery has emerged, raising fresh questions about the true nature of Iran’s nuclear ambitions.

Published Thursday by Fox News, the images reveal a covert facility nestled in Iran’s Semnan Province—an area already dotted with nuclear infrastructure. The site, previously unacknowledged by Iranian authorities, is being called the “Rainbow Site” by the opposition group National Council of Resistance of Iran (NCRI), which alleges that it plays a critical role in a clandestine nuclear weapons program.

While Tehran insists the facility is merely a chemical plant, the NCRI claims it is used to develop tritium—a rare radioactive isotope with no civilian application but potent military potential, especially for boosting the explosive yield of nuclear warheads.

“The presence of tritium production changes the narrative,” a senior opposition figure said. “It strongly suggests that Iran is not just enriching uranium for energy, but actively pursuing a weapon.”

Diplomatic tensions are rising in parallel. According to Iran International, sources close to the ongoing negotiations say the upcoming round of talks—already delayed last week—may be in jeopardy. Disagreements over Iran’s demand to continue uranium enrichment remain a central sticking point.

“Iran has agreed to rigorous IAEA inspections, and oversight frameworks are in place,” one Iranian diplomat revealed anonymously. “But enrichment is non-negotiable for Iran—and unacceptable for the U.S.”

The complexity deepens as Washington introduces new demands, including curbs on Iran’s ballistic missile development and its web of regional proxy forces. Tehran has reportedly agreed to temporarily restrain militias such as the Houthis in Yemen, in a bid to prevent Israel from intervening or derailing the talks.

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