Russia is considering joining China in banning Japanese seafood imports after Japan released treated radioactive water from the wrecked Fukushima nuclear power plant into the sea and is seeking talks with Japan over the matter, a Russian regulator said on Tuesday.

Japan started releasing the water from the plant into the ocean last month, drawing strong criticism from China. In retaliation, China imposed a blanket ban on all aquatic imports from Japan.

Russian food safety watchdog Rosselkhoznadzor on Tuesday said it had discussed Japanese food exports with its Chinese counterparts. Russia is one of the biggest marine product suppliers to China and is seeking to increase its market share.

"Taking into account the possible risks of radiation contamination of products, Rosselkhoznadzor is considering the possibility of joining with Chinese restrictions on supplies of fish products from Japan," Rosselkhoznadzor said in a statement. "The final decision will be made after negotiations with the Japanese side."

So far this year, Russia has imported 118 tonnes of Japanese seafood, the regulator said.

Rosselkhoznadzor said it had sent a letter to Japan on the need to hold talks and requesting information on Japan's radiological testing of exported fish products by Oct. 16, including tritium.

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Seafod at Hamanoeki Fish Market and Food Court

A view of locally caught seafood at the Hamanoeki Fish Market and Food Court in Soma, Fukushima Prefecture, Japan, on August 31, 2023.  (REUTERS/Kim Kyung-Hoon/File Photo)

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Japan says the water is safe after being treated to remove most radioactive elements except tritium, a radionuclide difficult to separate from water. It is then diluted to internationally accepted levels before being released.

Japan has said criticism from Russia and China was unsupported by scientific evidence.

On Monday, in its latest report on water testing, Japan's Ministry of Environment said analysis results of seawater, sampled on Sept. 19, showed the tritium concentrations were below the lower limit of detection at all 11 sampling points and would have no adverse impact on human health and the environment.

Russia has also detected no irregularities in marine samples used for tests in Russian regions that are relatively close to where the treated water was released, Rosselkhoznadzor's far eastern branch said on Tuesday, Interfax reported.

Russia exported 2.3 million metric tons of marine products last year worth about $6.1 billion, around half its overall catch, with China, South Korea and Japan being the biggest importers, according to Russia's fisheries agency.