What key recent events led to Iran's assault on Israel?

The hostility between the countries has only worsened in the six months since Hamas launched its attack on Israel.

 Iran's dramatic aerial attack on Israel follows years of enmity between the countries and marks the first time Iran has launched a direct military assault on Israel. The hostility between the countries has only worsened in the six months since Hamas launched its attack on Israel, which set off a war that continues to threaten to drag the entire region toward a broader conflict.

Here is a look at the key events leading up to Iran's assault:

Oct. 7 - Thousands of Hamas-led militants storm across the border into Israel, killing 1,200 people, mostly civilians, and taking roughly 250 captive, according to Israeli authorities. The assault triggers a devastating war that has killed more than 33,700 people, mostly women and children, according to local health officials. In launching the assault, Hamas hopes other regional enemies of Israel's will join. U.S. President Joe Biden warns Israel's regional foes not to get involved and sends military support to the Middle East.