Lebanese armed group Hezbollah retaliated to overnight Israeli strikes with rocket attacks on two bases near Tel Aviv and a naval base near Haifa on Tuesday.

The salvo came just hours before U.S. Secretary of State Antony Blinken's arrival in Israel to push for a cease-fire and ease growing tensions in the Middle East.

Diplomatic efforts have so far failed to bring an end to Israel's yearlong genocidal war in the Palestinian territory of Gaza and its spillover conflict between Hezbollah and Israel, which has intensified in recent weeks after a year of exchanges of fire mostly across Lebanon's southern border.

After a heavy night of Israeli strikes on Lebanon's south and the southern suburbs of its capital Beirut, Hezbollah said it had fired rockets at the Glilot base used by Unit 8200 of Israeli military intelligence and the Nirit area in Tel Aviv's suburbs.

The group said it also fired rockets at a naval base outside the port city of Haifa further north.

There were no immediate reports of casualties. Israeli authorities said air sirens were activated in areas southeast of Tel Aviv due to one projectile identified crossing from Lebanon and falling in an open area. Other sirens sounded in Tel Aviv.

Blinken's trip to the region is his 11th since the incursion of Israel by the Palestinian resistance group Hamas on Oct. 7, 2023, that triggered the Gaza war.

It comes as Israel intensifies its military campaign against Iran-backed groups – Hamas in the Gaza Strip and Hezbollah in Lebanon.

Blinken will try to revive negotiations to end the Gaza war and defuse the conflict in Lebanon in a weeklong Middle East visit which also includes Jordan and Qatar.

In Israel, he will discuss Israel's retaliation for Iran's Oct. 1 ballistic missile attack, a senior State Department official said, speaking on condition of anonymity.

A retaliation could disrupt oil markets and risks igniting a full-blown war between the archenemies.

Iran has written to the U.N. nuclear watchdog to complain about Israeli threats to strike its atomic energy sites, its Foreign Ministry spokesman said Monday.

Iran's Foreign Minister Abbas Araqchi, at a news conference in Kuwait during a regional tour, said Tehran does not seek war in the Middle East and has made efforts to reduce tensions but is prepared for any conflict.

Israel has vowed to attack Iran in retaliation for the volley of Iranian missiles on Oct. 1, stirring speculation that Iranian nuclear sites could be among the targets.

"We know that Israel does not follow any international rule. We have our own tools to defend ourselves and our nuclear infrastructure," Araqchi said.

"Attacking nuclear facilities is a big international crime, even threatening to attack nuclear sites is an international crime and goes against international laws," Araqchi said.

The U.S. official said that in meetings with Israel and Arab countries, Blinken will stress "day after" issues, particularly security, governance and reconstruction.

Having detailed plans for what happens when the hostilities eventually end are seen as a prerequisite for achieving any lasting resolution to the conflict.

Breakthrough hard

Experts say Hamas and Israel remain deeply at odds and are unlikely to make significant concessions before the Nov. 5 U.S. presidential election, which could upend U.S. policy.

In the last month, Israel has assassinated the leaders of Hezbollah in Lebanon and of Hamas in Gaza, while showing no sign of reining in its ground and aerial offensives.

The Biden administration has cast the killing of Hamas leader Yahya Sinwar by the Israeli military last week as a possible opening that would finally pave the way to end the Gaza war, but Israeli Prime Minister Benjamin Netanyahu says fighting will continue.

Sinwar has been accused of being a mastermind of the Oct. 7, 2023, incursion that caused 1,200 deaths, with about 253 more taken back to Gaza as hostages, according to Israeli tallies.

Israel's genocidal war, in response, has killed more than 42,500 Gazans with another 10,000 uncounted dead thought to lie under the rubble, Gaza health authorities say.

'UN resolution not enough'

U.S. envoy Amos Hochstein held talks with Lebanese officials in Beirut on Monday on conditions for a cease-fire between Israel and Hezbollah.

Hochstein said it was "not enough" for both sides to commit to U.N. resolution 1701, which ended the last round of conflict between Israel and Hezbollah in 2006 and which calls for southern Lebanon to be free of any troops or weapons other than those of the Lebanese state.

He said neither Hezbollah nor Israel had adequately implemented the U.N. resolution, and that while it would be the basis for the end to current hostilities, the U.S. was seeking to determine what more needed to be done to make sure it was implemented "fairly, accurately and transparently."