Russia’s veterinary agency Rosselkhoznadzor has unilaterally decided to temporarily ban imports of fresh fish from 13 Norwegian factories that it says have systematically supplied fish with veterinary or sanitary issues.

The move means more than a third of the 35 approved Norwegian exporters to Russia will find themselves shut off from Norway’s largest fresh salmon market.

In a statement issued Friday night , Rosselkhoznadzor also warned that any more imports into Russia that are found not to conform to requirements set by the Customs Union – the union of Belarus, Kazakhstan and Russia – would lead to a temporary ban on all imports of fresh fish from all Norwegian exporters.

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