WASHINGTON (Reuters) - The United States is concerned about Iran’s cooperation with North Korea and will do whatever it can to prevent it, Elliott Abrams, Washington’s envoy on Iran, said on Monday. Abrams was responding to a reporter’s question on whether the United States had seen evidence that Tehran and Pyongyang had resumed cooperation on long-range missile development. He spoke shortly after the Trump administration slapped new sanctions on Iran over its nuclear and weapons programs.