Turkey sealed its border with Syria to trucks on Wednesday, effectively cutting off a trade relationship once worth almost $3 billion with the embattled nation, as regime forces fought to evict opposition fighters from the country's largest city, according to AP. Two more Syrian diplomats, the envoy to Cyprus and her husband, the former ambassador to the United Arab Emirates, have also defected, according to the opposition Syrian National Council, in the latest sign of fraying support for the regime among its own elites. The announcement follows the televised appearance Tuesday night of a defected regime general calling for a new Syria. Turkish Economy Minister Zafer Caglayan said deteriorating security was behind the closure of a border through which Turkey once exported food and construction materials to the entire Middle East, though the volume of traffic had dropped 87 percent since the Syrian conflict began in March 2011.