Iran ramps up uranium production to weapons-grade levels on anniversary of General Soleimani’s killing

, Tehran had said hours earlier that a South Korean diplomat was due to travel three to negotiate over billions of dollars of assets frozen in Seoul.

The incidents come amid tensions between Iran and the United States during the last days of President Trump's term in office.

In 2018, Trump withdrew the US from the Iran nuclear deal, a foreign policy achievement of his predecessor Barack Obama.

The move isolated the US from its Western allies who signed the agreement in 2015.

Last year, the Pentagon justified the assassination of Soleimani, saying the Iranian general was "actively developing plans to attack American diplomats and service members in Iraq and throughout the region."

The drone strike came days after protesters attacked the US embassy in Baghdad, clashing with US forces at the scene.

The Pentagon said Soleimani approved the attacks on the embassy.

Following the assassination, Iran's supreme leader Ali Khamenei promised "harsh vengeance," "jihad" and "crushing revenge" against 35 US targets they have pinpointed in the wake of General Qasem Soleimani death.

Yesterday Iran slammed "imbecile" President Donald Trump and hinted that "revenge" for Qasem Soleimani's killing could come from "inside" the United States.

Chief of Iran's Iranian Revolutionary Guard Corps Quds Force Esmail Qaani reportedly stated the warning on Friday, an  reported.

's replacement Esmail Qaani, said: "For 30 years, you sought to assassinate our leaders Soleimani and [al-Muhandis], and an imbecile backed by the Zionists and the House of Saud committed this heinous crime.

"This criminal assassination [of Qasem Soleimani and Abu Mahdi al-Muhandis] opened the door for the free sons of our Muslim nation to take revenge.."