An Iranian woman holds up a small portrait of the country's supreme leader, Ayatollah Ali Khamenei, during an anti-US demonstration following the weekly Muslim Friday prayer in the capital Tehran on September 28, 2018. (Photo by STRINGER / AFP)

TEHRAN, Oct. 2 (Xinhua) -- Iran will not sit for talks with the United States over the existing issues as the conditions is not ripe, Iranian Foreign Minister Mohammad Javad Zarif was quoted as saying by Press TV on Tuesday.

"I'm not ruling out the prospect of talks (with Washington) provided the necessary conditions for talks, and that is reliability," Zarif said.

"Reliability is that when you sign something you are bound by it. Otherwise, everything will fall apart," he said, adding that "we are waiting for some sense of realism."

Iranian authorities have stressed that Tehran will not sit for negotiations under Washington's threats and sanction pressures.

Following U.S. President Donald Trump's decision to quit the historic Iran nuclear pact on May 8, the United States vowed to reimpose sanctions lifted under the accord against Iran and inflict punishments like secondary sanctions on nations that have business links with Iran.

Washington's withdrawal from the landmark Iran nuclear deal was criticized across the world. Some of its major European allies have been working to prevent the 2015 deal from falling apart.

Trump's administration has called for renegotiation of the Iranian 2015 nuclear deal as well as Tehran's developing missile program. Iran has ruled out possibility of talks over defense plans.