Zhong Changchun was sentenced to death in January for attacking the child, who had been walking to a Chinese class in south-eastern Chinese city of Shenzhen.
The circumstance had sent reverberations through both countries and fuelled political tensions amid claims of it being a racist attack.
” The Government of Japan considers the death of a totally innocent child to be an inexcusable violence, and we take this murder with the utmost solemnity,” the Chinese ambassador said in its statement to the BBC.
” In light of this event, the Chinese government will continue to take all possible safety procedures and clearly need the Chinese side to ensure the protection of Japanese citizens in China. “
It said that it had been informed of the murder by the Chinese Ministry of Foreign Affairs.
The event heightened concerns among Asian living in China and prompted Chinese firms including Toyota to question their staff to take steps. Some, like Panasonic, offered employees completely flights apartment.
The conviction on Zhong’s circumstance made no mention of Japan, Chinese officials previously said. Kenji Kanasugi, Japan’s adviser to China said Zhong had requested to speak to the murderer’s home, but did not say if he had been targeting Chinese citizens.
The event has even shone a light on the unregulated populism on Chinese social media, which has fuelled anti-foreigner sentiment in recent years.
Online critics noted that the schoolboy’s shooting happened on a socially sensitive time- 18 September, the celebration of an incident that led to the Japanese occupation of Manchuria in China in the early 1930s.
Traditional problems have long overshadowed social tensions between China and Japan. China has long demanded an apology from Japan for its colonial and military anger in the early and mid 20 Century. It has also accused Japan of glossing over its harsh military activities in China in its story books.
The stabbing even came amid a flurry of high-profile attacks on foreigners in China, including the punching of four American faculty in Jilin.
Last June, a man attacked a Chinese mother and her child at a bus stop in Suzhou but ended up killing a Taiwanese person trying to protect them. The gentleman has also been executed, Chinese officials said last month.