Iran on Wednesday hanged three men convicted of spying for Israel after what activists decried as an unfair trial, bringing to six the number of people executed on such charges since the start of the war between the Islamic republic and Israel.

The hangings have also amplified fears for the life of Swedish-Iranian dual national Ahmadreza Djalali who has been on death row for seven-and-a-half years after being convicted of spying for Israel which his family vehemently denies.

Lebanese militant group Hezbollah on Wednesday hailed what it called its ally Iran's victory over Israel after 12 days of war, declaring it the start of a "new historical phase".

In a statement, Hezbollah offered its "most sincere congratulations" to the Islamic republic, praising its "glorious divine victory".

The victory, it said, was "manifested in the precise and painful strikes it launched" against Israel, as well as "the lightning response to the American aggression against its nuclear facilities".

US President Donald Trump said Wednesday that progress was being made to end the Israel-Hamas war in Gaza, as a new ceasefire push began more than 20 months since the start of the conflict.

"I think great progress is being made on Gaza," Trump told reporters, adding that his special envoy Steve Witkoff had told him: "Gaza is very close."

He linked his optimism about imminent "very good news" to a ceasefire agreed on Tuesday between Israel and Hamas's backer Iran to end their 12-day war.

President Donald Trump said Wednesday that the United States would hold nuclear talks with Iran next week, teasing the possibility of a deal even after boasting that recent US strikes had crippled the Islamic republic's atomic programme.

Trump credited the unprecedented US attacks with the "total obliteration" of Iran's nuclear capabilities, and said they had set the country's programme back "decades".

But leaked US intelligence cast doubt on that assessment, saying the strikes had likely delayed Tehran by just a few months.

As the fragile Iran-Israel truce took hold, there was no letup in Turkey's diplomatic efforts Wednesday to prevent any return to a conflict fraught with risk for Ankara's domestic and regional policies.

Hours after US President Donald Trump announced the ceasefire, Turkey's President Recep Tayyip Erdogan met him for talks on the sidelines of a NATO summit for their third conversation in 10 days.

Erdogan's "intensive diplomatic efforts" to curb the conflict also involved calls with Russia's Vladimir Putin, Iran's Masoud Pezeshkian and top Middle Eastern leaders.

President Donald Trump said Wednesday that the fledgling ceasefire between Israel and Iran was going "very well" and teased new nuclear talks with Tehran, as leaked US intelligence cast doubt on the damage done to the Islamic republic's atomic programme.

Here are the latest developments on the second day of the ceasefire:

- Iran-US talks -

Trump said that the United States would hold fresh nuclear negotiations with Iran, even after boasting that US strikes had crippled its atomic programme.

Arriving in Tel Aviv after 12 days of war with Iran, Dorit Tzarum says among drinks on a crowded beach in the Israeli city that "it feels like California".

The devout Orthodox woman hasn't left her apartment in Jerusalem throughout the missile fire, scrupulously respecting the restrictions imposed by the Israeli government.

Travelling the 70 kilometres (43 miles) to Tel Aviv, she sits with her adult son Yair on a bench to watch the waves after the announcement of a ceasefire between Israel and Iran after 12 days of exchanging strikes.

Efforts to vaccinate children against deadly diseases are faltering across the world due to economic inequality, Covid-era disruptions and misinformation, putting millions of lives at risk, research warned Wednesday.

These trends all increase the threat of future outbreaks of preventable diseases, the researchers said, while sweeping foreign aid cuts threaten previous progress in vaccinating the world's children.

A new study published in The Lancet journal looked at childhood vaccination rates across 204 countries and territories.

It was not all bad news.

Elon Musk's AI chatbot Grok produced inaccurate and contradictory responses when users sought to fact-check the Israel-Iran conflict, a study said Tuesday, raising fresh doubts about its reliability as a debunking tool.

With tech platforms reducing their reliance on human fact-checkers, users are increasingly utilizing AI-powered chatbots -- including xAI's Grok -- in search of reliable information, but their responses are often themselves prone to misinformation.

With his surprise announcement of a ceasefire between Israel and Iran, US President Donald Trump has turned his flair for social media into diplomatic deftness, despite continued uncertainty in the Middle East.

Israel, Iran and Trump himself all declared victory after 12 days of conflict that culminated Saturday in the United States bombing Iran's key nuclear sites.