The United States has imposed sanctions on Iran previously as nuclear talks were under way.
Iran's "hobbled economy" is likely to keep them at the negotiating table, the Wall Street Journal reported on Sunday.
The UK announced that they have imposed sanctions on the Iranian-backed, Swedish-based criminal gang 'Foxtrot Network' and its leader, Rawa Majid
The US sanctioned the officials for involvement in the "abduction, detention, and probable death of former FBI Special Agent Robert A. Levinson."
It was Washington's fourth round of sanctions on Iran's oil sales since President Donald Trump said in February he was re-imposing a "maximum pressure" campaign.
Analysts said this might be a sign that Iran is facing supply chain issues after dramatically ramping up production following October 7.
"Decades of appeasement and containment of the Iranian regime has just emboldened them and harmed British interests."
The aircrafts' transponders - which enable them to be identified on air traffic control radars - were turned off on entry into Iranian airspace.
The European Union and the United States added new sanctions against Iran on Friday after its repeated supplies of weaponry to Russia and terror groups in the Middle East.
The new sanctions and other measures will "continue a steady drumbeat of pressure" to contain and degrade Iran's military capacity and effectiveness, National Security Advisor Jake Sullivan said.
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