(JNS) State Department spokesperson Ned Price said the United States is ready to walk away from ongoing nuclear talks in Vienna to revive the 2015 nuclear deal “if Iran displays intransigence.”

“We are prepared to walk away if Iran displays an intransigence to making progress,” Price told reporters, according to Reuters.

The United States and its allies will pursue “alternatives” if Iran is “unwilling to engage in good faith,” he said.

Iran said on Monday, February 28 that a deal could be reached if the United States agreed to its demands.

“Reaching a good deal is possible … three key issues still remain to be resolved. The U.S. and European powers have not taken political decisions on these major issues,” said Iran’s Foreign Ministry spokesperson Saeed Khatibzadeh, reported Reuters.

Two sources involved in the Vienna talks said that Iran has made new demands while continuing its assistance on previous ones.

After Iran’s lead nuclear negotiator, Ali Bagheri Kani, flew back to Tehran last week, “Tehran has become even more uncompromising …. they now insist on the removal of sanctions on the IRGC [Islamic Revolutionary Guard Corps] and want to open issues that had already been agreed,” one of the sources said, according to the report.