She also condemned North Korean aggression, saying the US will never accept a nuclear Pyongyang. "The freedoms that are enshrined in the United Nations charter are under attack in Iran", she said. "All freedom-loving people must stand with their cause", she said.
On New Year's Day Donald Trump tweeted: "Iran is failing at every level despite the awful deal made with them by the Obama Administration".
During a press conference on Tuesday, United States Ambassador to the United Nations Nikki Haley praised the Iranian people for publicly speaking against what she described as an oppressive regime. She said they must seize the moment instead of letting the regime overcome popular opposition, as it has in the past.
South Korea on Tuesday offered talks with North Korea next week, amid a tense standoff over Pyongyang's nuclear and missile programmes, after North Korean leader Kim Jong Un said in a New Year's Day speech that he was "open to dialogue" with Seoul.
She said: "This is the precise picture of a long opressed people rising up against their dictators". The global community made the mistake of failing to do that in 2009. "If the Iranian dictatorships history is any guide, we can expect more outrageous abuses in the days to come. We must not make that mistake again".
"We are still communicating with people in Iran on Facebook and Twitter and we're constantly updating those two sites in Farsi", said Goldstein. "We want to help amplify the voices of the Iranian people".
However, the secretary of state said last month that the U.S. would be "ready to talk any time North Korea ... and we're ready to have the first meeting without precondition".
The State Department has been communicating with protesters through their Farsi-language social media accounts, posting statements of support from USA and world leaders, despite the Iranian government's decision to block access to some websites.
Haley also noted the USA decision to cut aid to Pakistan, citing a "double game" in which Pakistan occasionally works with Washington while harboring terrorists that attack American troops in Afghanistan.
He held back judgment on Pyongyang's offer to talk, saying: "Perhaps that is good news, perhaps not we will see!" "I don't think we should be silent".
"However, as I said in December, we won't forget the Jerusalem vote".
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