The strike on Hezbollah’s stronghold in Lebanon's capital is a major escalation adding to fears of an all-out war.

Iran's U.N. envoy warned the country had the "right to take all necessary measures to respond to this egregious violation."

Israel is attempting a risky strategy, increasing the intensity of its attacks in an attempt to force Hezbollah to back down, while raising the chances of an aggressive response that devolves into a land war.