Japan still has a problem in viewing China's development, and it should "tweak its thinking", Chinese Ambassador to Japan Cheng Yonghua said in an interview with China Daily.

Serving as China's top envoy to Japan since 2010, Cheng said China-Japan ties are undergoing improvement, "but the momentum is still fragile" due to Japan's negativity, in word and deed, to China.

The reason behind this is Japan's problem in "how to view China's development," he said.

Foreign Minister Wang Yi summarized Japan's official attitude toward China, during a Tuesday press conference in Beijing, as "double dealing", and he urged Tokyo to think about "taking China as a friend or foe".

Cheng said Tokyo should reflect on its positions, basic ideas and policy measures on improving ties with China and check "if there are good follow-ups, and consistency".

"China attaches great importance to improving and developing China-Japan ties … it is hoped that both countries will work on improving ties on a consistent and stable basis. "

"However, messages delivered by Tokyo are blurred and unclear," Cheng added.