A Japanese man, who had been sentenced to prison in China in 2018 on spying and other charges, was released and arrived in Japan on Thursday, the government said.

Among Japanese citizens detained in China on espionage and other similar charges since 2015, the 59-year-old has become the first to return to his home nation after completing a full sentence.

The Japanese government has denied he engaged in spying. Details of the alleged espionage have not been disclosed.