Iran’s foreign minister threatened that the country will expand its nuclear program if the United States doesn’t take a “new approach” toward the Iranian nuclear program.

Javad Zarif released a speech over Twitter on Wednesday, marking the 42nd anniversary of the 1979 Iranian revolution. In it, he railed against U.S. sanctions targeting Ayatollah Ali Khamenei’s regime and menaced further expansion of its nuclear program, which is already feared to be close to the point of producing viable weapons.