Japan consular officials meet detained national in China

Japan now really know how being detain with limited access, only one visit a day with limited duration 20-30 minutes per visit.

Which happen to many foreigners in Japan

https://tokyo.philembassy.net/consular-section/services/atn-corner/arrest-procedures/life-in-prison/

Visiting hours at the detention prison are strictly limited, with no provision for after-hours access. Visitors are allowed to make only one visit a day, which is generally limited in duration. The timing of visits may also be affected by the availability of language-qualified prison officials to monitor the meeting

maybe Japan should start arresting Chinese spies here. We know there are a lot of them.

"Strongly demanding" something is not going to do anything, by now it has become clear this is the way China does things and anybody visiting the country should understand this risk is present.

Since 2014, 17 Japanese nationals, including the Astellas employee, have been detained in China for alleged involvement in espionage activities. 

Maybe not spy, so you won't be arrested for spying.

Like to see Chinese officials visiting there spys in Japan. It would never happen.