Kirby said in a briefing with reporters on Friday that the Saudis informed the US about their talks with the Iranians.
He added the United States wasn’t involved in the agreement.
Earlier, a White House National Security Council spokesperson told the Reuters news agency, “Generally speaking, we welcome any efforts to help end the war in Yemen and de-escalate tensions in the Middle East region.”
“De-escalation and diplomacy together with deterrence are key pillars of the policy President [Joe] Biden outlined during his visit to the region last year,” the diplomat continued.
Iran and Saudi Arabia have reached an agreement in the Chinese capital of Beijing to restore their diplomatic relations and re-open embassies and missions within two months, seven years after their ties were broken off over several issues.
The agreement was struck on Friday after several days of intensive negotiations between Secretary of Iran’s Supreme National Security Council (SNSC) Ali Shamkhani and his Saudi counterpart in Beijing. It was officially announced in a joint statement by Iran, Saudi Arabia and China.
The statement was inked by Shakhani, Musaid Al Aiban, Saudi Arabia’s national security adviser, and Wang Yi, the director of the Office of the Central Foreign Affairs Commission of the Chinese Communist Party.
Iran, Saudi Arabia and China expressed their firm determination to make their utmost efforts to promote regional and international peace and security, according to a statement.
Saudi Arabia severed diplomatic relations with Iran in January 2016 after Iranian protesters, enraged by the execution of prominent Shia cleric Sheikh Nimr Baqir al-Nimr by the Saudi government, stormed its embassy in Tehran.
The two sides had held five rounds of negotiations in the Iraqi capital of Baghdad since April 2021.
In their joint statement, Iran and Saudi Arabia also thanked Iraq and Oman for hosting the talks between the two sides in 2021 and 2022 as well as the leaders and government of the People’s Republic of China for hosting and supporting the talks held in that country.
