The United States has imposed sanctions on key Yemeni Houthi figures for their support of terrorist acts targeting merchant shipping in the Red Sea, according to the US Treasury Department. In particular, the measures are aimed at four individuals who supported recent Houthi attacks on commercial vessels in the Red Sea and Gulf of Aden, including the hostage-taking of civilian crews. “Continuous terrorist attacks by the Houthis on commercial vessels and their civilian crews that pass legally through the Red Sea and the Gulf of Aden threaten to disrupt international supply chains and freedom of…