“China is a country under the rule of law. All foreign nationals in China must abide by Chinese laws, and offenders are prosecuted according to law,” she added.
Japanese government spokesman Hirokazu Matsuno told reporters earlier on Monday that Tokyo’s embassy in China had been informed “this month that a Japanese man in his fifties was detained in Beijing”.
He gave no details on the man’s identity, nor his alleged crime, or when he had been arrested.
He added that Tokyo was also seeking consular access to the man.
In October 2019, Chinese authorities detained a Japanese professor, reportedly on suspicion of spying. He was released and returned to Japan the following month.
And in March 2020, China’s foreign ministry said it had arrested a Chinese man reportedly working as a university professor in Japan who they claimed had confessed to spying.