China has begun testing all seafood imports from Japan for radiation, Japanese media reported Wednesday, in a move that could create further diplomatic headaches for Prime Minister Fumio Kishida.

The news comes ahead of Japan’s plan to begin releasing treated radioactive water from the crippled Fukushima No. 1 plant into the sea. It follows a July 7th announcement by China’s customs agency that seafood products from 10 prefectures, including Fukushima, would continue to be banned due to radiation concerns.

Chief Cabinet Secretary Hirokazu Matsuno told reporters in Tokyo on Wednesday that there have been cases where some Japanese seafood exports are being held up by Chinese customs. The reason for this is seen as a result of China's tightened radiation inspections in response to the planned release of treated water from the nuclear power plant.