North Korea and Iran have resumed long-range missile cooperation, which includes the transfer of critical parts, Reuters reported on Monday, citing a senior U.S. official who did not provide detailed evidence.

The official, who was speaking of a broader U.S. plan to sanction people and entities linked to Iran’s weapons programs, did not elaborate on when Pyongyang and Tehran first started working together, or when they stopped and began again, according to the report.

North Korea and Iran have forged close ties against the United States and have long been suspected of cooperating to build ballistic missiles and nuclear weapons…

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