The Israeli airstrike on Iran's Parchin complex in October has hindered Iran's ability to develop a nuclear bomb, according to Israeli officials. The attack destroyed sophisticated equipment used for shaping and testing plastic explosives that encase uranium in a nuclear device. Iran has resumed research related to nuclear weapons in the past year, but has not taken concrete steps towards building a bomb. The destroyed equipment is considered a bottleneck for Iran's nuclear development, and finding an alternative won't be easy. The strike also sends a message about Israel's access to Iran's secret activities.