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This report summarizes and assesses open-source evidence about transnational ties between violent extremist groups based in the United States and foreign state and non-state actors. Drawing from the detailed group profiles developed by the Mapping Militants Project, we find that the violent RMVE and AGAAVE universe is characterized by unstructured connections. U.S.-based RMVE and AGAAVE groups do not engage in widespread or systematic cooperation with foreign state and non-state actors. Rather, the connections that do exist across national borders are episodic, informal, fluid, and largely undirected. While we expect that these ties will not result in coordinated mass-casualty attacks in the near term, transnational relationships clearly have the potential to inspire acts of domestic terrorism by amplifying dangerous ideologies and spreading tactics and strategies to commit violence.