The United States resumed airstrikes inside Iran Wednesday night in retaliation for Tehran’s attempted surprise ballistic-missile attack on American forces, as an Iran expert warned that the regime has become increasingly willing to test Washington despite its weakened military capabilities.

Behnam Ben Taleblu, senior director of the Iran program at the Foundation for Defense of Democracies, said the surprise nature of Iran’s attack reflected a significant shift in Tehran’s strategy.

"What makes this attack different is that it’s basically a surprise attack," Taleblu told Fox News Digital. "This is the Islamic Republic matching its deeds with its words," he said. "That means a more risk-tolerant, more confident, perhaps less capable, but more dangerous Iran in the Middle East."

U.S. Central Command said the Islamic Revolutionary Guard Corps launched multiple ballistic missiles from Iran at U.S. forces in the region at approximately 5:45 p.m. Eastern Time Tuesday. All were intercepted, and no casualties or damage were immediately reported.

Trump later vowed a forceful response, telling Fox News chief foreign correspondent Trey Yingst that the United States would be "hitting them hard" and that Iran was "going to get a beating." "We're going to beat the f---ing s--- out of them," Trump said.