BEIJING -- The U.S. will soon propose changes to its security controls on the export of high-technology products to China as the administration rethinks its approach to the system, according to a top U.S. trade official. The export controls are designed to monitor trade in "dual-use" goods, or products that can have civilian and military uses. The designation covers a widening range of technology products as a result of the growing role of information and communication systems in modern warfare. Balancing security and business concerns is difficult for U.S. policy makers. The widening trade deficit with China has increased the...