Experts suggest the U.S. has a strategic opportunity to leverage Iran's weakened position for a nuclear deal after Israel's targeted strikes on Iranian nuclear and military sites.

Iran will take even tougher action against Israel if attacks escalate President Masoud Pezeshkian warned during a cabinet meeting in Tehran on Sunday. He spoke after both sides launched fresh attacks on each other overnight into Sunday.

Sirens sounded in Israel as Iran launched dozens of ballistic missiles in retaliation for Israel's strikes on its nuclear facilities.

Israel's conflict with Iran represents far more than another Middle Eastern crisis—it marks the emergence of a dangerous new chapter in nuclear rivalries that has the potential to reshape global proliferation risks for decades to come.