Iranian-backed Houthi rebels struck a military camp for government forces in southern Yemen on Monday, killing at least 20 soldiers, Yemeni military officials said, in one of the deadliest attacks in the recent surge in fighting.

The rebels fired ballistic missiles on the al-Alam military camp in the southern province of Shabwa in an attack that also wounded at least two dozen troops. The military officials with the internationally recognized government of Yemen spoke on condition of anonymity because they were not authorized to brief the media.

French President Emmanuel Macron on Monday began a Gulf tour aimed at securing oil and diesel supplies in an effort to bring down prices, after a weekend of violent protests sparked by soaring living costs.

Macron, just hours after slamming France's "unbridled" violence in an address late on Sunday, arrived in OPEC member Kuwait where he was welcomed by the emir, Sheikh Mishal Al-Ahmad Al-Jaber Al-Sabah.

Russia's foreign minister has arrived in Tehran for his first visit since the outbreak of the Middle East war, Russian news agencies reported on Monday, as Moscow seeks to play a mediating role.

Arriving from Bahrain, Sergei Lavrov was scheduled to meet with Iranian President Masoud Pezeshkian and Foreign Minister Abbas Araghchi.

U.S. embassies across much of the Middle East urged Americans to increase their vigilance on Monday, citing a "complex security environment" and travel disruptions eight months into the U.S.-Iran war.

Embassies in the Gulf, Israel, Iraq, Lebanon and Jordan issued a security alert saying: "Americans currently in the Middle East should exercise heightened vigilance due to the complex security environment.

Israeli Prime Minister Benjamin Netanyahu vowed Monday that Israel will not hesitate to strike its enemies at a moment's notice, eight days before a tight election and following his warnings to Iran.

Netanyahu said he spoke to the commander of an unspecified base and saw Israel's "capability to strike our enemies the moment it is required."

Israeli police said they arrested 10 people on Monday in connection with a wave of settler violence that included attacks on a foreign journalist and European diplomats in the occupied West Bank over the weekend.

Israel had come under heavy international criticism for the attacks. Israeli police did not identify the suspects or specify their roles in the attacks, which came during a spike in settler violence during the annual Palestinian olive harvest season.

President Donald Trump on Sunday endorsed embattled Israeli Prime Minister Benjamin Netanyahu late in his reelection campaign, a coveted boost because of Trump's popularity but one that the American had withheld for months as the vote neared and the leaders' strategies in the Middle East diverged.

Trump said in a post on social media that Netanyahu "has been a Great Warrior Prime Minister, and an even greater Partner for Peace in combatting the Islamic Republic of Iran."

U.S. Vice President JD Vance — who participated in negotiations with Iran over the summer — has defended President Donald Trump's Iran strategy, and said the Trump administration is looking for a "final firm commitment from the Iranians that they're not going to rebuild their nuclear program."

U.S. President Donald Trump has predicted that the ongoing war with Iran will end “very quickly,” promising that American gas prices will fall below pre-war levels once hostilities cease.

Saudi Arabia said that it had intercepted a fresh wave of incoming drones, as its ally Egypt weighed sending the kingdom help in defending against repeated attacks from Yemen's Houthis.