Nasrallah gave an emotional address on Friday, threatening to respond to Israel’s war in Gaza against the Palestinian militant group Hamas.
“All options are on the table on the Lebanese front,” Nasrallah vowed, saying he would respond with greater hostility if Lebanese civilians are harmed.
Israeli Prime Minister Benjamin Netanyahu on Friday delivered a warning of his own.
“Don’t test us,” he said in a video address. “You’ll pay an unimaginable price.”
Hezbollah, which was created by Iran in the early 1980s, shares the ideology with its founder of destroying Israel.
Hezbollah has traded near-daily artillery and rocket fire at the Israel-Lebanon border since the war with Hamas broke out in early October.
To deter a second front from opening up, the U.S. has deployed hundreds of troops and two aircraft carriers to the eastern Mediterranean.
Nasrallah said the U.S. would not deter him and the American support signals Israel is vulnerable.
“Israel is weaker than a spider web,” he said.
Secretary of State Antony Blinken, who traveled to Tel Aviv on Friday to meet with Israeli leadership, warned Hezbollah against taking any action.
“We have been very clear from the outset that we are determined that there not be a second or third front opened in this conflict,” he said.
Read full coverage of the Israel-Hamas war at TheHill.com.