Still, he also maintained that his group wanted to see the current ceasefire last, even as he slammed Lebanese efforts to engage Israel in direct talks on ending hostilities and its occupation of the south.

The Israeli military first mentioned the so-called Yellow Line in Lebanon on Saturday after the start of the 10-day truce, using the term it gave to the demarcation in Gaza that separates areas held by its forces from those controlled by militant group Hamas.

In an interview with AFP from Lebanon's parliament, Fadlallah said "we will bring down this Yellow Line through the resistance (Hezbollah), with our insistence on our legitimate right to defend ourselves and our country".

"The steps the Israeli side has taken are stupid steps," he added.

US President Donald Trump had announced the truce in Lebanon, which was dragged into the Middle East conflict on March 2 when Hezbollah fired rockets at Israel in support of its backer Iran.

Tehran had insisted that a truce in Lebanon was part of the conditions for its own ceasefire with Washington in the broader war.

Hezbollah and Israel have since accused each other of violating the truce.

Fadlallah said his group briefed Tehran "on all Israeli violations" with the aim of conveying this information to "the Pakistani side so that it, in turn, can also exert pressure". Islamabad is the principal mediator between Iran and the US.

- No 'one-sided' truce -

After the ceasefire went into force, Hezbollah said it was keeping its "finger on the trigger" in case of any Israeli violations.

"We want the ceasefire to continue and to be accompanied by a tireless effort for the occupying army to withdraw from our land and for all displaced people to return to their villages... as well as the release of prisoners and then a reconstruction program," Fadlallah said.

He stated, however, that his group would not accept any agreement that brings the situation back to what it was after its 2024 war with Israel.

Israel never stopped bombing Lebanon despite the 2024 truce, accusing Hezbollah of rearming.

"There will not be a one-sided ceasefire," Fadlallah said.

"When the Israeli side commits violations and attacks, the resistance will certainly not stand idly by."

Over the past year, Beirut has taken several unprecedented steps against Hezbollah, committing to disarming it in 2025 and outlawing its military activities last month.

It also made the decision to hold direct talks with Israel for the first time in decades.

Hezbollah and its supporters strongly reject these moves.

"No one in Lebanon or abroad will be able to disarm the resistance," according to Fadlallah, who called the planned direct talks "a political path to offer free concessions".

- 'Interest of Lebanon' -

"It is in the interest of Lebanon, the president of the republic and the government to move away from the path of direct negotiation and return to a national understanding about the best option for Lebanon," Fadlallah told AFP.

"We will reject and confront any attempt to impose political costs on Lebanon through concessions made to this Israeli enemy."

Hezbollah repeatedly points to Iran's role in the current ceasefire and pins hopes on the negotiation process between Tehran and Washington in Islamabad, despite uncertainty over where it stands.

Fadlallah expressed his faith that "the Iranians know how to get rid of the pressures and preserve their legitimate rights".

While Lebanese authorities insist their negotiations with Israel are separate from any other regional talks, Fadlallah said "there is a political track currently underway in Islamabad, and we place great hopes on it, because Iran stands with Lebanon".