The Israel military said on Sunday that its fighter jets hit thousands of Hezbollah rocket launcher barrels in southern Lebanon that were aimed for immediate fire toward northern and central Israel.
More than 40 launch areas in Lebanon were struck during the early morning strikes, it said in a statement.
The Hezbollah group had earlier confirmed launching hundreds of rockets and drones against Israel in retaliation for the assassination of a senior commander in Beirut last month.
It said the barrage had completed "the first phase" of its response to the assassination of Fuad Shukr, but that the full response would take "some time".
Expectations of an escalation between the two sides had risen since a missile strike in the Israeli-occupied Golan Heights last month killed 12 youngsters, followed by the killing of Shukr in Beirut.
Foreign Minister Israel Katz said Israel would respond to developments on the ground but did not seek a full-scale war. Defence Minister Yoav Gallant said Israel would do whatever necessary to defend itself.
Gallant declared a state of emergency, and flights to and from Ben Gurion airport in Tel Aviv were suspended for around 90 minutes.
Meanwhile, Lebanon's state news agency said that an Israeli air strike on a car in the southern Lebanese town of Khiam on Sunday left one person dead.
US President Donald Trump said on Tuesday he had ruled out putting American troops on the ground in Ukraine, but said the country might provide air support as part of a deal to end Russia's war in the country.
A Ukrainian drone attack late on Tuesday knocked out power to areas of Ukraine's Zaporizhzhia region under Russian control, the Moscow-installed governor said.
Israel is demanding the release of all 50 hostages held in Gaza, Israeli public broadcaster Kan cited the prime minister's office as saying on Tuesday, as talks on a proposed deal envisaging a 60-day truce and release of half the hostages continue.
U.S. President Donald Trump said on Tuesday he hoped Vladimir Putin was going to "be good" and move forward toward ending the war in Ukraine, but conceded it was possible the Russian president doesn't want to make a deal.
Aid worker killings rose nearly a third to almost 400 last year, the most deadly year since records began in 1997, and the conflict in Gaza is continuing to cause high death rates for humanitarian staff in 2025, U.N. and other data showed.