A newly released report showed that at least 333 people were executed in 2021, a 25-percent increase compared with 267 in 2020.
President Ebrahim Raisi says the armed forces will not let Israel rest if it takes action targeting Tehran, days after he warned neighbouring Iraq against using its territory for activities that disrupt Iran's security.
Tehran's decision to move the facility comes as diplomatic efforts to restore Iran’s tattered nuclear deal appear stalled.
Israel hosted the foreign ministers of four Arab nations and the US as signals mount that a 2015 agreement on Iran's nuclear programme will soon be restored.
The European Union's Josep Borrell says the deal is at "95 percent but the last five percent is critical," as EU coordinator for the nuclear talks, Enrique Mora, travels to Tehran to close gaps in the negotiations.
Amid the reshuffling of regional dynamics and the wider tug-of-war between the US and Russia, Tehran has reverted to its modus operandi of violence and chaos.
Complications have surfaced after Russia demanded guarantees that Western sanctions imposed on its economy would not affect its trade with Iran, analysts say.
"This must not be postponed any longer and cannot be postponed any longer. Now is the time to finally say yes to something that represents a good and reasonable solution," German Chancellor Olaf Scholz says during a visit to Israel.
Ebrahim Raisi arrived in Doha on Monday on the first visit by an Iranian president to Qatar in 11 years and as Gulf states closely watch indirect US-Iranian talks to salvage a 2015 nuclear pact.
Iran's Foreign Minister Hossein Amirabdollahian told Munich Security Conference that "we believe prisoner swaps is a humanitarian issue ... unrelated to the nuclear accord".
According to experts, the strategy of the world powers appears to be "pressuring Iran to bring the talks to a conclusion".
Iranian Foreign Minister Hossein Amir-Abdollahian said the US "can declare in the form of a political statement their commitment" to a possible agreement as talks continue in Vienna to restore the 2015 nuclear deal.
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