He used a televised speech to warn the import of American and British vaccines were "forbidden", citing the surging death tolls from the virus in both countries as evidence for their rejection.
In a publicly broadcast speech on Friday, the supreme leader said Iran does not insist on and is in no rush for the U.S. to re-sign the Joint Comprehensive Plan of Action (JCPOA), which established limits on Tehran's nuclear enrichment. China and Russian Federation are both allies of Iran, the Middle East country hardest hit by the coronavirus.
The ban was met with calls from Iranian activists and Trump supporters to have Khamenei's account also removed.
A series of moves this week appeared aimed at increasing Iran's leverage before Democrat Joseph Biden Jr. becomes president on January 20.
Recently, Iran defended its decision to resume 20 percent uranium enrichment to "defend security and vital interests".
Tensions between Washington and Tehran have risen since 2018, when President Donald Trump abandoned Iran's 2015 nuclear deal and reimposed sanctions to pressure Tehran into negotiating stricter curbs on its nuclear program, ballistic missile development and support for regional proxy forces.
Twitter announced Friday evening that it was officially banning Trump from the platform after he incited a mob of supporters to descend on the Capitol and wreak havoc.
"This is their democracy; this is their elections' situation", Khamenei said, smirking, during his address. "But what is logical is our demand, is the lifting of the sanctions". "If they were able to create a vaccine ... why do they want to give it to us?"
Iran has been the worst-hit country by the coronavirus in the Middle East.
It began human trials of its first domestic vaccine late last month, although some citizens have expressed scepticism about its effectiveness.
Where will Iran get its vaccines?
Iran's leaders say the harsh economic sanctions, which Washington reimposed after pulling out of the landmark Iranian nuclear agreement in 2018, have made it hard for their country to access vaccines.
Such false claims, it said, include statements about vaccines that invoke deliberate conspiracy and those suggesting that vaccines are used to harm or control populations.
Authorities said then that USA -based benefactors plan to deploy scores of thousands of Pfizer-BioNTech coronavirus to Iran.
On October 10, Iranian President Hassan Rouhani announced Iran's "readiness to participate in the production of a Covid-19 vaccine with China". Worldwide banks and financial institutions are reluctant to deal with Iran for fear of American penalties.
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