Israel killed Hezbollah's military chief in a strike on Beirut on Sunday, the Israeli military and the militant group said, hitting an apartment building and killing five people according to Lebanese authorities.

Haytham Ali Tabatabai, Hezbollah's top military chief whom Israel killed on Sunday, had taken the role after the group's senior leaders died in the most recent war with Israel.

He is the most important Hezbollah figure to have been killed since a November 2024 ceasefire sought to end over a year of hostilities between the militant group and Israel, including two months of full-blown war.

Hezbollah confirmed that senior leader Haytham Ali Tabtabai was killed in Israel's strike on Beirut's southern suburbs on Sunday.

Washington and Kyiv said that any eventual deal to halt the war with Russia must fully uphold Ukraine's sovereignty, after "constructive" talks between U.S., Ukrainian and European officials in Geneva.

Israel's military announced the dismissal of three generals and disciplinary actions against several other senior officers over their failure to prevent the October 2023 assault by Hamas, the deadliest attack in Israel's history.

Ukrainian President Volodymyr Zelensky on Monday hailed "important steps" after a Geneva summit with the U.S., but said more was needed to end a nearly four-year war following the Russian invasion.

Israel said it carried out an air strike Sunday targeting Hezbollah's chief of staff in Beirut's southern suburbs, hitting an apartment building in an operation which Hezbollah said crossed another red line.

Israeli Prime Minister Benjamin Netanyahu insisted on Sunday that Israel would do "everything necessary" to stop Hezbollah from regrouping in Lebanon and Hamas from doing the same in Gaza.

Over the past week Israel has hit multiple targets in neighboring Lebanon, with the Israeli military saying on Saturday it had struck Hezbollah launchers and military sites.

U.S. Secretary of State Marco Rubio arrived in Geneva Sunday morning for discussions on a U.S. plan to end the Ukraine war, after Washington signalled room for negotiation on the controversial proposal.

Iran's intelligence ministry has warned of attempts by foreign adversaries, including the United States and Israel, to target supreme leader Ayatollah Ali Khamenei and destabilise the Islamic republic.