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Venezuelan Vice-President Tareck El Aissami (Photo by AP) The US has imposed sanctions against Venezuelan Vice-President Tareck El Aissami over his alleged involvement in drug trafficking, in yet another hostile measure that could spark fresh tensions between the two countries. Late on Monday, the US Treasury Department blacklisted El Assiami and his associate, Venezuelan businessman Samark Lopez, over allegations of having a role in global drug trafficking. As part of the sanctions effort, 13 companies owned or controlled by Lopez -- including five based in the US state of Florida -- will be blocked and both men will be banned from entering the United States. Lopez stands accused of serving as El Aissami’s “key front-man” to launder drug proceeds and purchase assets. El Aissami, who has long denied any criminal ties, did not immediately react to Washington’s move. Since his days as interior minister, El Aissami has been the target of US law enforcement investigation over allega