VIENNA (Sputnik), Daria Chernyshova, Anastasia Levchenko — US Energy Secretary Ernest Moniz is among the US delegates, the correspondent said.
US Secretary of State John Kerry is also in Coburg. He arrived in Vienna overnight. The top US diplomat is due to hold talks with Iran's Foreign Minister Mohammad Javad Zarif.
Tehran and the P5+1 group of world powers — Russia, the United States, China, France, Britain and Germany — are racing against the clock to agree on a final comprehensive deal before the deadline expires on Tuesday. The agreement is meant to secure the peaceful nature of Iran's nuclear program in exchange for sanctions easing.