Sales of imported vehicles in South Korea surged 17.5 percent last month from a year earlier, helped by aggressive marketing strategies by local car dealers, a trade association said Tuesday. A total of 8,964 imported vehicles were sold here in June, compared with 7,629 units sold a year earlier, according to the Korea Automobile Importers and Distributors Association (KAIDA). Sales in June also represented a 2.1 percent gain from the 8,777 cars sold a month earlier.