Iran fired a new wave of missile attacks on Israel early Monday, triggering air raid sirens across the country as emergency services reported at least five killed and dozens more wounded in the fourth day of a conflict between the regional foes that showed no sign of slowing.

But Israel's formidable and sophisticated military forces - with an arsenal largely, but not exclusively, provided by the United States - are enabling it to overpower a much larger enemy. The BBC looks at the military balance in the latest war in the Middle East.

The president had opposed Israeli action against Iran but came to believe that Israel had reason to act and that the U.S. would have to lend some support.

The death toll is rising as Israel and Iran traded missile strikes for a third straight day. The death toll grew Sunday as Israel and Iran exchanged missile attacks for a third consecutive day, with Israel warning that worse is to come.

President Donald Trump warned that "it's possible" that the United States "could get involved" in the ongoing Israel-Iran conflict if it continues to escalate during an exclusive interview with ABC News' Rachel Scott on Sunday (June 15).

Despite public opposition, Trump pulled the U.S. out of the original Iran nuclear deal in 2018. That arrangement, signed by several world powers, restricted Iran’s nuclear program in exchange for sanctions relief. Countries and organizations around the world lamented the U.S.’s withdrawal, while conservatives and Israel celebrated it.

As an unprecedented Israeli attack on Iran last week sparks a spiraling conflict between the two enemy states, China has seen an opportunity to cast itself as potential peace broker – and an alternative voice to the United States.

Iran and Israel continued on Sunday their aerial attacks, which began Friday with a series of Israeli strikes on Iran.