US President Joe Biden, who left Washington to attend two international summits in Rome and in Glasgow, plans to meet his Turkish counterpart Recep Tayyip Erdogan and consult with his allies on resuming negotiations with Iran, according to the White House.

"I anticipate he will meet with the president of Turkey in Glasgow," he told reporters aboard Biden's plane headed to Rome for an earlier G20 summit. 

Sullivan was speaking from Air Force One in which Biden was traveling to Rome to attend the G20 summit the weekend before the COP26 conference.

Erdogan had told the Turkish press that he would meet Biden in Glasgow, not Rome, while he recently retracted the expulsion of the Western ambassadors, including the ambassador of the United States.

Relations between the two presidents are tense, especially because Ankara acquired a Russian defense system, even though it is a member of NATO.

Biden will participate in two important international events at the end of the week, the Summit of the 20 industrialized countries, which opens Saturday in Rome, and the United Nations conference on climate change, starting Sunday, in Glasgow, Scotland.

Sullivan said that on the sidelines of the G-20 summit on Saturday, Biden would meet the heads of state and government of Germany, France, and Britain regarding Iran to discuss "attempts to resume negotiations" to return to the international agreement on Tehran's nuclear program.

He explained that this quadripartite meeting aims to "focus on a common strategy" characterized by "unity and solidarity" between Americans and Europeans.

On Wednesday, Iran expressed its readiness to resume negotiations in November to save the international agreement after a five-month stalemate. However, Westerners approached this situation with caution.

On Sunday, Biden plans to organize in Rome, in addition to the official program of the Group of 20, a meeting to discuss the chaos of production and distribution chains at the global level.