Japan warns Sumitomo after SDF weapon blueprints leaked to China Sorry, but your browser needs Javascript to use this site. If you're not sure how to activate it, please refer to this site: https://www.enable-javascript.com/ Chief Cabinet Secretary Katsunobu Kato speaks at a news conference at the Prime Minister's Office Thursday. | KYODO Kyodo May 21, 2021 The government has issued warnings to Sumitomo Heavy Industries Ltd. and a subcontracted firm after the latter leaked blueprints for parts of a military-use prototype machine gun to a Chinese company, the company and the government spokesman said Thursday. The Economy, Trade and Industry Ministry issued the warnings on April 28 on the grounds that the subcontractor had violated Japan’s foreign exchange and trade control law, as the weapons were to be procured for the Ground Self-Defense Force if selected in a tender.