The Kremlin, asked on Monday if Russia had held consultations with Iran before or after Tehran responded to a letter from U.S. President Donald Trump urging the country to negotiate a nuclear deal, said Iran formulates its own policy positions.

Iran's Supreme Leader criticized "bullying" nations in response to Donald Trump's letter, which called for negotiations over Iran's nuclear program. Khamenei's remarks followed the US President's offer for a new round of talks with Tehran.

Trump said on Friday he had warned Tehran in a letter it could face military action unless it agreed to talks for a nuclear deal. In a furious response on Saturday, Ayatollah Ali Khamenei said Iran would not negotiate with "bullying governments" insisting on talks.