Iran's foreign ministry warned on Monday of "unforeseen" consequences following Ukraine's attack on an Iranian vessel in the Caspian Sea over the weekend.

"This action by Ukraine was an absolutely illegal and unjustified act, contrary to the Charter of the United Nations, as well as a dangerous act of adventurism that will certainly not go unanswered by us," the ministry's spokesman Esmaeil Baqaei said in a weekly press briefing, adding that the consequences of Ukraine's action "will certainly be unforeseen".

Syrian state media said Israeli forces carried out an incursion into the country's south on Sunday, a day after the visiting U.N. chief urged an end to Israeli violations and respect for Syria's sovereignty.

State news agency SANA said that "Israeli occupation forces carried out an incursion early Sunday into the villages of Maariya and Al-Aarda in the Yarmuk basin in the west of Daraa province".

Palestinian officials said Israeli settlers set fire to two mosques in the occupied West Bank overnight Sunday, after this week's deadly clashes in the territory left six people dead.

Iran passed another night without U.S. airstrikes on Sunday, as Washington paused a war nearing its fifth month and reports emerged that concerns over dwindling munitions were restraining plans for further escalation.

The lull has revived hopes of a return to negotiations after nearly two weeks of consecutive nightly U.S. bombardments, although U.S. media reported the pause could also reflect pressure on stockpiles of Patriot interceptors and other defensive weapons.

Israeli Prime Minister Benjamin Netanyahu will meet US President Donald Trump at the White House on Tuesday, the Israeli leader's office said.

Palestinians in the occupied West Bank village of Tell on Saturday buried four men killed during a clash with Israeli settlers in the village the previous day, local officials said.

United Nations Secretary-General Antonio Guterres urged international support for Syria on Saturday as he visited the country, which is in transition following years of war and the overthrow of longtime ruler Bashar al-Assad.

Yemen's Iran-backed Houthi rebels claimed a missile attack on Saudi Arabia on Saturday as U.S. President Donald Trump mulled fresh strikes on the Islamic republic in the deepening Middle East war.

Iran's Revolutionary Guards warned civilians in the Middle East on Friday to stay away from U.S. forces, state media reported.

Israeli Prime Minister Benjamin Netanyahu vowed a forceful response Friday after a clash in the West Bank killed an Israeli and four Palestinians, while the military announced preparations for a new operation in the occupied area.