Iran's highest national security body warned on Sunday that a response was "imminent" following an Israeli strike targeting Tehran's ally Hezbollah in Beirut's southern suburbs.

The Israeli military said Sunday that its forces had killed a senior Hezbollah militant accused of involvement in the kidnapping and killing of five American soldiers in Iraq in 2007.

Iran said on Sunday there was "no point" in peace talks with the United States, accusing it of failing to uphold its commitments and casting doubt on a deal that Donald Trump had insisted would be signed imminently.

Lebanon's foreign ministry said it had lodged a complaint with the United Nations over Israel's alleged spraying of herbicide glyphosate in Lebanese territory near the border earlier this year.

The Israeli military said three drones, suspected to have been launched by Hezbollah from Lebanon, struck northern Israel in separate incidents on Sunday, causing no casualties.

Lebanon reported Israeli strikes in the country's south on Saturday, as the Israeli army issued evacuation warnings for the city of Nabatieh and more than 20 other locations ahead of raids.

A Qatari delegation arrived in Tehran on Sunday, Iranian media and a diplomat said, as part of the mediation process to end the war between Iran and the United States.

Iran's Fars news agency said on Sunday that Tehran has not made a final decision on signing the agreement under discussion with the United States to end the Middle East war.

U.S. President Donald Trump said that a deal with Iran to end the Middle East war could be signed Sunday, and that the strategic Strait of Hormuz would be "open to all" immediately after.

An aid convoy organized by the Vatican envoy to Lebanon that was headed for Christian villages in the country's south was stopped by the Israeli military and forced to change course, a convoy member told AFP.