Israel's military chief Eyal Zamir declared on Sunday, 21 June that the ceasefire announced in Lebanon the previous day remains “fragile,” according to an official statement from the Israel Defence Forces (IDF). The warning came as Israeli units continued operating in southern Lebanon and senior commanders were placed on high alert for a possible resumption of hostilities.

Zamir's Warning to Commanders

Speaking during a situation assessment with senior commanders of units deployed in southern Lebanon, Zamir stressed that the military must sustain a high level of readiness for the renewal of combat operations and the elimination of threats. He underscored that the IDF's primary objective remains the protection of communities in northern Israel.

“We are in the midst of a multi-front operation and continue to defend against Hezbollah,” Zamir said, signalling that the ceasefire had not translated into a drawdown of Israeli military posture.

Hezbollah's Reported Condition

Zamir claimed that Hezbollah has suffered a severe and significant blow and is currently in a very “difficult position.” He noted that over the preceding two days, the Israeli military had reportedly neutralised a significant tier of mid-level command within several Hezbollah units. The assertion, while unverified independently, points to a sustained Israeli campaign targeting the group's operational structure even as a ceasefire was nominally in effect.

Notably, this is not the first time Israel has declared a ceasefire while simultaneously maintaining offensive readiness in Lebanon — a pattern that has drawn scrutiny from regional observers and diplomats.

US Vice President Vance on Iran Talks and Lebanon

Meanwhile, US Vice President JD Vance said on Sunday that negotiators had already made “great progress” in talks with Iran at a Swiss resort overlooking Lake Lucerne. The senior delegations were meeting to discuss Tehran's nuclear programme and wider regional security issues.

“We’ve already made great progress over just the last few hours, and I expect that we’ll make additional progress in the hours to come,” Vance told reporters before the talks resumed.

Asked whether he had a message for Israeli Prime Minister Benjamin Netanyahu regarding Israel’s military operations in Lebanon, Vance remained measured but optimistic. “There, of course, are going to be sometimes disagreements about precisely how to get there, but I actually feel great about where we are in Lebanon. There’s still some additional wood to chop, but we’re going to keep on working,” he said.

Broader Regional Context

The Lebanon ceasefire and the Iran nuclear talks are unfolding simultaneously, reflecting the interlocked nature of the Middle East’s security architecture. Renewed fighting in Lebanon has the potential to derail diplomatic momentum on the Iran front, making the fragility Zamir described a concern that extends well beyond Israeli-Lebanese borders. This comes amid a broader US effort to stabilise the region ahead of what officials have described as a critical diplomatic window.

What to Watch

Whether the Lebanon ceasefire holds in the coming days will be a key indicator of whether broader diplomatic efforts — including the Iran talks in Switzerland — can gain traction. Any resumption of large-scale hostilities would likely reset negotiations and test the limits of US diplomatic leverage in the region.