The nuclear agreement between Western powers and Iran was broadly welcomed by politicians, former world leaders and Middle East experts.
As Sergei Lavrov and John Kerry bid for a peaceful resolution to Syria, a former British diplomat says the US is "taking on the master".
Is Russia's proposal for international monitors to oversee Syria's arsenal of chemical weapons, serious diplomacy or just making trouble?
The US State Department has described remarks said to have been made by Israel's defence minister about John Kerry as "offensive and inappropriate".
Moshe Yaalon reportedly denounced Secretary of State John Kerry's quest for Israeli-Palestinian peace as "messianic" and "obsessive".
"The only thing that can save us is if Kerry wins the Nobel prize and leaves us alone," he was quoted as saying by the newspaper Yedioth Ahronoth.
US State Department spokeswoman Jen Psaki said that if accurate, Mr Yaalon's remarks were "offensive and inappropriate, especially given all that the United States is doing to support Israel's security needs".
The defence minister, who stopped short of denying he had made the attack on Kerry, later described the US as an ally of utmost importance.
Israel and the Palestinians are making progress towards reaching a framework peace agreement but they are not there yet, US Secretary of State John Kerry has told reporters.
Kerry was speaking after about three hours of talks with Palestinian President Mahmoud Abbas in Ramallah, the Palestinian seat of government in the West Bank.
Kerry is on his tenth trip to the region in the past year as he seeks to secure a peace deal. He said he would visit Saudi Arabia on Sunday to discuss the talks with King Abdullah.
The US state department has posted a picture of the staff's gift to Secretary of State John Kerry for his 70th birthday - a box of cookies:
US Secretary of State John Kerry has sought offer assurances to Israel over the Iran nuclear deal, saying that the agreement would make Israel safer over the next six months.
Kerry told CNN's State of the Union: "Israel is threatened by what has been going on in Iran.
"But I believe that from this day - for the next six months - Israel is in fact safer than it was yesterday, because we now have a mechanism by which we are going to expand the amount of time in which they [Iran] can break out [toward creating a nuclear bomb].
"We are going to have insights to their program that we didn't have before".
Foreign Secretary William Hague has returned to London for a meeting with US Secretary of State John Kerry on the Middle East.
Mr Hague wrote on Twitter:
US Secretary of State John Kerry has arrived in the UK ahead of his meeting with Foreign Secretary William Hague on the Middle East peace process.
Mr Hague and Mr Kerry are also expected to discuss the latest developments in Syria and Libya.
Foreign Secretary William Hague and US Secretary of State John Kerry will have talks in London tomorrow on the Middle East, the State Department has said.
As well as further discussions on Iran, they are expected to consider the latest developments in Syria and the Middle East peace process.
Libyan officials will also be present at the meeting, the State Department added.
US Secretary of State John Kerry has arrived in Geneva ahead of high-level talks on Iran's nuclear programme.
A State Department press officer tweeted this photo of him arriving at the airport:
US Secretary of State John Kerry will travel to Israel on Friday to discuss a proposed deal with Iran on the country's nuclear programme, Israeli Prime Minister Benjamin Netanyahu has said.
Mr Netanyahu has condemned a proposal, endorsed by Washington, to reduce sanctions on Iran if Tehran suspends parts of its nuclear work.
The Israeli prime minister said he would discuss the issue with French President Francois Hollande, who arrives in Israel later today, and with Russian President Vladimir Putin when he visits Moscow on Wednesday.