Japan’s communications ministry on Tuesday urged LY Corp., the operator of the Line messaging app, to strengthen the protection of users’ personal data following a massive data breach. The Ministry of Internal Affairs and Communications said the app provider relies heavily on Naver Corp. of South Korea, a major shareholder of LY, to operate the app system and lacked appropriate countermeasures against cyberattacks. The ministry called on the Japanese company to improve its operations through a review of its capital relationship with Naver as it is under “considerable influence” from the South …