Iran live updates: Trump to hold national security meeting Monday, officials say

At least 14 people -- among them two children -- were killed by Israeli strikes in southern Lebanon on Sunday, according to the Lebanese Ministry of Health, despite a ceasefire agreement between Israel and the Iran-backed Hezbollah militia.

Also on Sunday, the Israel Defense Forces reported that an Israeli soldier had been killed in combat in Lebanon.

Israeli Prime Minister Benjamin Netanyahu has accused Hezbollah of undermining the ceasefire. The group has fired into northern Israel on several occasions, with authorities there now reviewing Home Front security guidelines for citizens.

Earlier on Sunday, the IDF said it intercepted a projectile fired towards Israeli soldiers positioned in southern Lebanon. The IDF said it was striking Hezbollah infrastructure in Sunday's attacks.

-ABC News' Ghazi Balkiz, Jordana Miller and Guy Davies

President Donald Trump is expected to hold a meeting with key members of his national security team concerning the situation in Iran on Monday, according to two U.S. officials familiar with the plans.

The anticipated meeting comes as the Trump administration has grown increasingly bullish on the impact of its ongoing naval blockade of Iran's ports and increasingly skeptical that talks with Iran's current negotiators can yield the desired results, one of the officials said.

The official added that while Iran has proposed new terms for a deal to more permanently resolve the conflict between the countries over the weekend, those terms still appear to fall well short of the administration's red lines.

-ABC News' Shannon K. Kingston

Iranian Foreign Minister Abbas Araghchi will meet with Russian President Vladimir Putin in St. Petersburg during his scheduled trip to Russia Monday, according to Iran’s ambassador to Russia, Kazem Jalali.

"In continuation of the diplomatic jihad to advance the country's interests and amid external threats, the Foreign Minister of the Islamic Republic of Iran will meet with the President of Russia during his trip to St. Petersburg," Jalali said in a post on X Sunday afternoon.

It was a busy weekend for Araghchi, who traveled to Oman once and Pakistan twice before heading to Russia Sunday evening.

Iran’s semi-official news agencies Fars and ISNA reported that Tehran conveyed written messages to the U.S. via Pakistani mediators, letters that addressed some of Iran’s “red lines,” including issues related to its nuclear program and the blockade of the Strait of Hormuz.

-ABC News' Claire Bower

Iran’s main news agency IRNA reports that the country’s top diplomat, Foreign Minister Abbas Araghchi, departed Islamabad, Pakistan, late Sunday for Moscow, where he’ll discuss regional developments and bilateral Iran-Russia relations with senior Russian officials.

Iran’s Ambassador to Moscow Kazem Jalali also posted on Telegram that Araghchi hopes to meet with Russian President Vladimir Putin during his visit Monday.

-ABC News' Claire Bower and Anna Sergeeva