Israel and Iran’s air war entered a second week on Friday and European officials sought to draw Tehran back to the negotiating table after President Donald Trump said any decision on potential U.S. involvement would be made within two weeks.

Israel began attacking Iran last Friday, saying it aimed to prevent its longtime enemy from developing nuclear weapons. Iran retaliated with missile and drone strikes on Israel. It says its nuclear programme is peaceful.

Israeli air attacks have killed 639 people in Iran, said the Human Rights Activists News Agency. Those killed include the military’s top echelon and nuclear scientists. Israel has said at least two dozen Israeli civilians have died in Iranian missile attacks. Reuters could not independently verify the death toll from either side.

Israel has targeted nuclear sites and missile capabilities, and sought to shatter the government of Supreme Leader Ayatollah Ali Khamenei, according to Western and regional officials.

“Are we targeting the downfall of the regime? That may be a result, but it’s up to the Iranian people to rise for their freedom,” Israeli Prime Minister Benjamin Netanyahu said on Thursday.

Iran has said it is targeting military and defence-related sites in Israel, although it has also hit a hospital and other civilian sites.

Israel accused Iran on Thursday of deliberately targeting civilians through the use of cluster munitions, which disperse small bombs over a wide area. Iran’s mission to the United Nations did not immediately respond to a request for comment.

With neither country backing down, the foreign ministers of Britain, France and Germany along with the European Union foreign policy chief were due to meet in Geneva with Iran’s foreign minister to try to de-escalate the conflict on Friday.

“Now is the time to put a stop to the grave scenes in the Middle East and prevent a regional escalation that would benefit no one,” said British Foreign Minister David Lammy ahead of their joint meeting with Abbas Araqchi, Iran’s foreign minister.

U.S. Secretary of State Marco Rubio also met Lammy on Thursday and held separate calls with his counterparts from Australia, France and Italy to discuss the conflict.

The U.S. State Department said that Rubio and the foreign ministers agreed that “Iran can never develop or acquire a nuclear weapon.”

Lammy said the same on X while adding that the situation in the Middle East “remained perilous” and a “window now exists within the next two weeks to achieve a diplomatic solution.”

Russian President Vladimir Putin and Chinese President Xi Jinping both condemned Israel and agreed that de-escalation is needed, the Kremlin said on Thursday.

The role of the United States remained uncertain. Lammy also met Trump’s special envoy to the region, Steve Witkoff, on Thursday in Washington, and said they had discussed a possible deal.

Witkoff has spoken with Araqchi several times since last week, sources say.