Nissan Motor Co., the best-selling Japanese automaker in China, said deliveries are off as it cut back on marketing events in the wake of violent anti-Japan demonstrations last month.

Nissan has reduced the number of promotional activities on the advice of Chinese authorities, Nissan Chief Operating Officer Toshiyuki Shiga said Thursday at an auto forum in Chengdu, Sichuan Province. The impact is difficult to quantify, he said.

Shiga's comments may be among the first from a major company acknowledging fallout from the Senkaku Islands dispute that has soured diplomatic ties and triggered the protests.