Iran has vowed to keep fighting until its adversaries surrender, rejecting U.S. President Donald Trump’s claims that its military capabilities have been significantly degraded and warning of “even harsher” attacks.

Tehran will not accept the "vicious cycle of war, negotiations, ceasefire and then the repetition of the same pattern," Foreign Ministry spokesperson Esmail Baghaei said Thursday, according to the state news agency IRNA.

Iran will continue to resist for as long as the war continues, Baghaei said.

A spokesperson for Iran's armed forces headquarters echoed this stance, telling the ISNA news agency that Iran's enemies should "wait for even harsher measures."

He dismissed Trump's assertion that Iran's capabilities had been depleted, saying U.S.-Israeli attacks had hit only insignificant targets.