Beijing on Monday over what he said were instances of stones being thrown at diplomatic missions and schools in China, following the release of wastewater from the Fukushima nuclear plant.
Last week, China banned all seafood imports from its neighbour after Japan began releasing cooling water from the stricken Fukushima plant in an operation that Tokyo and the UN's nuclear watchdog have said is safe.
Since then, Japanese businesses ranging from bakeries to aquariums have received reportedly thousands of sometimes abusive crank calls from Chinese numbers.
«There have been numerous harassment calls believed to originate from China and instances of stones being thrown into the Japanese embassy and Japanese schools.
It must be said these are regrettable,» Fumio Kishida told reporters.