India, Feb. 18 -- Iran has not accepted all the "red lines" defined by US President Donald Trump for a diplomatic resolution, Vice President JD Vance said Tuesday after talks in Geneva.

Vance signaled that Washington remains engaged in diplomacy, even as Trump warned of potential military action if Iran fails to address key concerns, starting with its nuclear program.

"In some ways, it went well; they agreed to meet afterwards," Vance said in a Fox News interview.

"But in other ways, it was very clear that the president has set some red lines that the Iranians are not yet willing to actually acknowledge and work through," Vance told "The Story with Martha MacCallum" program.

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