Iran's foreign minister blamed the West for lack of an agreement in nuclear talks in Vienna and stressed that Tehran will not back down from it "red lines."

Iranian Foreign Minister Hossein Amirabdollahian discussed with European Union foreign policy chief Josep Borrell the latest status of the talks in Vienna, Iran's foreign ministry said in a tweet on Monday.

Amirabdollahian said "a lack of serious will on the part of the West to reach a good and credible agreement in Vienna has led to unnecessary prolongation of the talks," the ministry added.

Amirabdollahian also stressed in the call that Iran will not back down from its red lines.

Iran interrupted the negotiations last June for five months as it said its new government needed time to organize. After returning to talks in late November, it demanded to renegotiate issues already agreed upon in the first six rounds of talks from April to June.

Reuters quoted an Iranian official on Monday that Tehran is demanding 300 more US sanctions to be lifted in addition to nuclear-related ones that Washington has already indicated ready to remove.