South Korea's finance minister Hong Nam-ki, meanwhile, has criticized Japan's move to restrict exports of high-tech materials...saying that it's a clear act of economic retaliation.In an interview with CBS radio on Thursday,... Hong said... the government will come up with countermeasures if Japan doesn't withdraw the regulations... adding that such a move will not only hurt the Korean economy but also Japan's.As for possibly filing a complaint with the World Trade Organization... Hong said, the government will decide *when to file the complaint as soon as an internal review is over... but that it takes a long time for the result to come out once the complaint is filed.