On Sunday, US Secretary of State Antony Blinken stated that the US was “totally in lock step” with Britain, Germany, and France in resuming nuclear discussions with Iran, but that it was uncertain whether Tehran was willing to resume the talks in a “serious way.”

Blinken’s comments came a day after the United States, Germany, France, and the United Kingdom urged Iran to restore compliance with a 2015 nuclear deal in order to “prevent a disastrous escalation.”

The agreement, which saw Iran reduce nuclear activities that may lead to the development of nuclear weapons in exchange for the removal of global sanctions, fell apart in 2018 after then-President Donald Trump withdrew the US, causing Tehran to break the pact’s uranium enrichment limits.

On Iran entering the nuclear talks, Blinken stated, “It really depends on whether Iran is sincere about achieving that.” “All of our countries, working with Russia and China along the way, believe it is the best course ahead,” he added.

Leaders of the four countries hoping to persuade Tehran to stop enriching uranium to near-weapons-grade levels, said on Saturday they wanted a negotiated solution.

“But we do not yet know whether Iran is willing to come back to engage in a meaningful way,” Blinken said on Sunday. “But if it isn’t, if it won’t, then we are looking together at all of the options necessary to deal with this problem.”

Iran’s foreign minister said separately on Sunday that if the United States was serious about rejoining Tehran’s 2015 nuclear deal with world powers, President Joe Biden could just issue an “executive order,” the state-owned Iran newspaper reported.

“It is enough for Biden to issue an executive order tomorrow and they (U.S.) announce they are rejoining the pact from the point where his predecessor left the deal,” Iranian Foreign Minister Hossein Amirabdollahian said. “If there is a serious will in Washington to return to the deal, there is no need for all these negotiations at all.”

Talks between Iran and world powers aimed at salvaging the deal, which started in April, are slated to resume at the end of November, the Islamic Republic’s top nuclear negotiator said on Wednesday.