“Our goal in all this is to ensure that we again have verifiable and permanent restrictions on the Iranian nuclear program, so that Iran cannot acquire nuclear weapons,” RIA Novosti Price quoted as saying.

He stressed that "the patience of the United States is not unlimited."

Price said the US proposal to negotiate with Iran under the auspices of the EU with the participation of the "six" international mediators is still in force.

Earlier, US President Joe Biden said at the Munich Security Conference that the United States is ready to return to negotiations on a Joint Comprehensive Plan of Action on Iran's nuclear program in the 5 + 1 format.