By David Brunnstrom and Chris Gallagher WASHINGTON (Reuters) -The United States on Wednesday imposed sanctions on six North Koreans, one Russian and a Russian firm it said were responsible for procuring goods from Russia and China for North Korea’s weapons programs, an action that follows a series of North Korean missile launches, including two since last week. The U.S. Treasury Department said the steps aimed to prevent the advancement of North Korea’s weapons programs and impede its attempts to proliferate weapons technologies. It said they followed six North Korean ballistic missile launche…

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