This week, the Korean Ministry of Commerce, Industry & Energy described Japan's punitive tax plan as "unreasonable and disappointing", and claimed it has "no legal basis". It said that while discussions between the two nations have sought to resolve the matter, little progress has been made. It also said that it would consider legal action in Japan.
Many other countries already tax imports of Hynix products, including the U.S. and European Union. Hynix has fought them every step of the way as well, but did not prevail. From a consumer standpoint, it means more expensive RAM (at least Hynix-based) in Japan, though other options are open.