Moscow banned imports of most food from the West on Thursday in retaliation against sanctions over Ukraine, a stronger than expected measure that isolates Russian consumers from world trade to a degree unseen since Soviet days.

Russian share prices fell after the announcement of Moscow’s one year ban on all meat, fish, dairy, fruit and vegetables from the United States, the 28 European Union countries, Canada, Australia and non-EU member Norway.

The ban affects all meat, fish, poultry, fruit and vegetables from the listed countries, but does not include other food items – mostly commodities such as grains, seed oils, sugar, coffee, tea and cocoa. Russia spent $25.5 billion last year on imports in the affected categories, $9.2 billion of it from the countries hit by the ban.

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