United Nations Secretary-General Antonio Guterres on Sunday, 15 June strongly condemned fresh Israeli air strikes on Beirut, Lebanon's capital, warning that the attacks were threatening a fragile diplomatic window for peace. The condemnation came as Washington and Tehran were reportedly close to an agreement that could bring an end to the broader regional conflict.

Guterres Calls for Maximum Restraint

In a formal statement, the UN chief said the strikes occurred despite an existing ceasefire, at a particularly sensitive moment in diplomacy. “This conflict is having a devastating impact on the world’s economy,” Guterres said. He urged all parties to “show maximum restraint at this crucial moment” and expressed strong hope for “a successful outcome of the ongoing efforts by the United States and the Islamic Republic of Iran.”

IDF Strikes Hezbollah Command Centre, Braces for Retaliation

The Israel Defense Forces (IDF) confirmed it had struck a Hezbollah command centre in Beirut's southern suburbs on Sunday. In a subsequent statement, the IDF said it was preparing for possible retaliatory fire into Israel within hours and remained on high alert for both defensive and offensive scenarios. The situation assessment was conducted by Israeli army chief Eyal Zamir alongside all relevant commanders.

In response to the security assessment, the IDF's Home Front Command imposed a nationwide gathering restriction capping public assemblies at a maximum of 5,000 people. The order led to the cancellation of large stadium concerts scheduled for Sunday evening in the Tel Aviv area.

Iran Issues Stark Warning to Israel

On Monday, Iran warned that any further Israeli “aggression and malicious acts” — including in southern Lebanon — would trigger a “severe and crushing” response from Tehran. Iranian Parliament Speaker Mohammad Bagher Ghalibaf, in a post on social media platform X, said Israel's renewed attack on Beirut demonstrated that the United States “lacks either the will or the ability to fulfil its commitments.”

“The bad cop and good cop game has become outdated. If you lack the will and ability to fulfill your commitments, speaking of continuing the path is not possible,” Ghalibaf added.

Diplomatic Stakes and What Comes Next

The strikes and Iran’s sharp rebuke come at a moment of acute diplomatic sensitivity. US and Iranian negotiators were reportedly on the cusp of an agreement that observers had hoped would stabilise the region. Notably, the IDF attack on a Hezbollah command centre — even as ceasefire terms nominally remained in place — risks derailing those talks entirely. This is not the first time military action has undercut diplomatic progress in this conflict; a similar pattern played out in earlier rounds of negotiations. The coming hours will be critical in determining whether the diplomatic track survives the latest escalation.