Meanwhile Donald Trump says his early G7 exit has "nothing to do" with an Israel-Iran ceasefire, as fighting between the two nations enters a fifth day.

Iran has launched a new wave of missile attacks on Israel, triggering air raid sirens across the country as emergency services reported at least five killed and dozens more wounded in the fourth day of open warfare between the regional foes.

Iran began its retaliation against Israel for its surprise attack with over 100 ballistic missiles. The Israel Defense Forces announced the expected retaliation, with Iranian state media showing footage purporting to be some of the launches.

Iran announced it had launched some 100 missiles and vowed further retaliation for sweeping attacks on its military and nuclear infrastructure.

TEL AVIV, Israel (AP) — Iran fired a new wave of missile attacks on Israel early Monday, killing at least five people, while Israel claimed in the fourth day of the conflict that it had now achieved “aerial superiority” over Tehran and could fly over the Iranian capital without facing major threats.