The escalating spat has already seen Beijing advise Chinese citizens to avoid travelling to Japan.

"Pay attention to your surroundings and avoid as much as possible squares where large crowds gather or places that are likely to be identified as being used by many Japanese people," the Japanese embassy in China said in a statement on its website dated Monday.

Minoru Kihara, Japan's top government spokesman, said Tuesday that such advice was issued "based on a comprehensive assessment of the political situation, including the security situation in the relevant country or region, as well as the social conditions."

The diplomatic feud between China and Japan was ignited by Takaichi's suggestion that Tokyo could intervene militarily in any attack on Taiwan.

China claims Taiwan is part of its territory and has threatened to use force to bring the democratic island under its control.