Japanese firms have complained about China's environmental policies, saying they are too strict to obey.
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The planned zone would include Macau and a clutch of mainland cities as well as the territory.
Kim Jong Un could extend an olive branch to Japan to receive aid to rebuild North Korea's stagnant economy.
Beijing has voiced a willingness to maintain relatively amicable ties with Tokyo, at a time when its relationship with Washington has grown increasingly acrimonious.
Large-scale sales of U.S. dollar-denominated assets would also trigger depreciation of the dollar against the yen, hitting Japanese exports.
Detention of popular protest leader throws rights issues into the spotlight, threatening to further exacerbate tensions between Beijing and Tokyo.
Retail sales of consumer goods plunged 11.4 percent, and the total value of imports dropped 3.3 percent in the first half of this year.
Tokyo, wary of repercussions from Beijing, finds itself in a dilemma as it faces calls from Washington and others to help safeguard rights of the city's residents.
At least 20 percent of Japanese people who were working in the Chinese capital have yet to come back, a survey conducted in late March showed.
Beijing has been making friendly overtures toward Tokyo, with an eye on economic revival after the pandemic passes, diplomatic sources have said.