Those who have problems with Ramaphosa are rubbing their hands in glee at what they see as reinforcement that he is captured by those who funded his campaign, writes Chris Vick.
Zarif spearheaded the negotiations with the Obama administration on the 2015 nuclear deal, which President Donald Trump withdrew the US from in 2018.
The crew of Britain's Stena Impero is safe and in good health, Iran insists, but the company has been unable to contact them.
The announcement comes as nuclear and military tensions between Tehran and the West continue to mount after two British-linked ships were seized.
Iran seized a British-flagged tanker in the Strait of Hormuz in what appears to be a retaliation for Britain's seizure of an Iranian ship this month.
The capture, reported by the state-run Mehr news agency, comes days after a UAE-based tanker was reported missing in the same area.
The US blames Iran for two tanker explosions and a drone shooting near the Strait of Hormuz. Some 21 million barrels of oil pass through it every day.
"Threats to international freedom of navigation require an international solution," a Defense Department spokesman said to INSIDER.
Iran's tanker was seized in Gibraltar, where authorities say they had reason to believe that it was violating sanctions by bringing oil to Syria.
Rouhani ridiculed the Trump administration in a live broadcast on Tuesday. It came after the US issued targeted sanctions on Iran's Supreme Leader.
Last week Trump ordered then abruptly cancelled an airstrike against military targets in Iran after Tehran downed a US drone.
The footage appears to be Tehran's attempts to prove that the 23 crew members on board the British-flagged Stena Impero are in "good health."
Iran is safely storing its crude and freeing up its tankers, while China can tap the stockpile if supply is disrupted or sanctions end.
Iranian forces seized the UK-flagged tanker Stena Impero in the Strait of Hormuz on Friday. There were 23 crew members aboard the ship.
President Donald Trump said on Thursday that the USS Boxer shot down and "immediately destroyed" an Iranian drone near the Strait of Hormuz.
Iran has been expressing frustration with the other parties who signed the 2015 deal at not helping Iran after the US-imposed sanctions.
Stocks climbed on Thursday after US Federal Reserve Chair Jerome Powell strongly hinted the central bank will cut rates this month.
Iran has said it will pursue nuclear talks with European nations in the coming days, and that the US could join if it removes sanctions.
EU powers on Tuesday said they "regret" Iran's decision to breach its nuclear stockpile limit. Hassan Rouhani also vowed to increase the stockpile.
While the US has become the world's top energy exporter thanks to a boom in fracking, it still imports more than 30,000 barrels of oil a month from countries in the Middle East.
Mohammad-Javad Azari Jahromi, an Iranian minister, said the US was devoting "a lot of effort" to attacking Iran, but was yet to achieve anything.
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