The Biden administration on Wednesday imposed its first sanctions over North Korea’s weapons programs following a series of North Korean missile launches, including two since last week, Reuters reported.

The sanctions targeted six North Koreans, one Russian, and a Russian firm Washington said were responsible for procuring goods for the programs from Russia and China.

The U.S. Treasury said the steps aimed both to prevent the advancement of North Korea’s programs and to impede its attempts to proliferate weapons technologies.

The Treasury Department said the sanctions followed six North Korean ballistic missile launches since September, each of which violated U.N. Security Council resolutions.

U.S. Under Secretary of the Treasury for Terrorism and Financial Intelligence Brian Nelson said the moves targeted North Korea’s “continued use of overseas representatives to illegally procure goods for weapons.”

North Korea’s latest launches were “further evidence that it continues to advance prohibited programs despite the international community’s calls for diplomacy and denuclearization,” Nelson said in a statement.