Iranian Foreign Minister Abbas Araghchi on Monday blamed the United States for the failure of peace talks in Pakistan, after arriving in Russia for a meeting with President Vladimir Putin.

"The U.S. approaches caused the previous round of negotiations, despite progress, to fail to reach its goals because of the excessive demands," Araghchi was quoted as saying by Iranian state media.

The Israeli military said on Sunday that a soldier was killed in southern Lebanon, where a ceasefire has been in place since mid-April.

Sergeant Idan Fooks, 19, died "during combat" in south Lebanon, while "an officer and three additional soldiers were severely injured, along with a soldier who was moderately injured and a soldier who was lightly injured", the military said.

Lebanon's health ministry said Israeli strikes on the country's south on Sunday killed 14 people, the deadliest day since a ceasefire in the Israel-Hezbollah war came into force over a week ago.

It came as Israel and the Iran-backed group traded fresh accusations of breaching the fragile truce, with Prime Minister Benjamin Netanyahu saying the military was "vigorously" targeting Hezbollah and the group vowing to keep responding to "violations".

Israeli Prime Minister Benjamin Netanyahu on Sunday said Hezbollah's actions were threatening the ceasefire between Israel and Lebanon, as he pledged to "vigorously" target the Iran-backed group.

"It must be understood that Hezbollah's violations are, in practice, dismantling the ceasefire," Netanyahu said during a weekly cabinet meeting.

Lebanese official media said Israel's military began striking the country's south on Sunday after issuing an evacuation warning for seven locations, despite a ceasefire with Hezbollah.

"Israeli warplanes launched a strike" in Kfar Tibnit -- one of the locations included in the warning -- the state-run National News Agency said, adding that there were reports of casualties.

Iran's foreign minister was due to return to Pakistan on Sunday as international mediators try to keep peace talks on track despite U.S. President Donald Trump calling off his envoys' planned trip.

U.S. President Donald Trump said Saturday a shooting at the White House Correspondents' Association dinner would not deter him from the Iran war, although he believed the incident was unlikely linked to the conflict.

International efforts to mediate between the United States and Iran were in the balance on Sunday, after President Donald Trump canceled his envoys' planned trip to Pakistan for talks.

U.S. Secret Service agents bundled Donald Trump from the stage as shots rang out Saturday evening at a media gala, in what the president later described as an attack by a "would-be assassin."

U.S. President Donald Trump and other attendees at a glitzy media gala in Washington made a hasty exit Saturday night after gunshots were fired.

As details continue to emerge and investigations are underway, here is what we know about the shooting: