The United States and Iran said Monday they had again traded strikes, straining an already fragile ceasefire as negotiations between the two sides have stalled.

Weeks of complicated talks marked by sharp rhetoric and occasional flare-ups of violence have not managed to reach a deal to end the war and reopen the Strait of Hormuz, which is essential to oil supplies.

The Israeli army announced Monday that two of its soldiers had been killed in separate incidents in southern Lebanon, bringing to 27 the number of Israeli military deaths since early March.

President Joseph Aoun said Monday that Lebanon was facing "a vicious and reprehensible Israeli aggression", after Israel stepped up its offensive against Hezbollah with the capture of the medieval Beaufort Castle.

Aoun condemned the Israeli offensive in a post on X and pledged to "work to end the suffering of the Lebanese people, and people in the south in particular".

Iran's chief negotiator warned the United States is not to be trusted Sunday, saying Tehran would not agree to any deal with Washington unless it fully secures Iranian rights.

An Israeli strike near a hospital in Tyre, south Lebanon wounded 13 staffers, the Lebanese health ministry said, as Israel pushes forward its offensive deeper into the country.

Israeli Prime Minister Benjamin Netanyahu on Sunday said he ordered the Israeli army to deepen its deployment in Hezbollah strongholds north of the Litani River, noting that "soon Hezbollah will no longer have the ability to threaten northern Israel."

France has requested an emergency meeting of the United Nations Security Council after Israeli forces seized the medieval Beaufort castle in Lebanon, the French foreign minister said Sunday.

Israel's flag flew over the medieval fortress on Beaufort in Lebanon on Sunday as it warned Lebanese civilians to evacuate a large area of the south of the country ahead of stepped up ground operations.

Shelling was audible and smoke rose from the surrounding area as the invading army's banner was seen by AFP above the castle, which Israeli forces famously used as a base during their previous two-decade long occupation.

The Israeli army announced Sunday that one of its soldiers had been killed the previous day by a Hezbollah explosive drone in southern Lebanon, bringing to 25 the number of Israeli military deaths since early March.

The Israeli military warned Lebanese civilians living south of the Zahrani river to evacuate the region Sunday, warning that it was stepping up operations against Hezbollah.