The Biden administration is planning to crack down on banks and financial services firms that are helping Russia evade strict sanctions on access to military technology and equipment that are aiding its war against Ukraine, according to senior administration officials.

The move, which will be announced on Friday, comes after attempts by the United States to curb Russia’s access to supplies that it needs to build more missiles and other weapons have proved to be unsuccessful.

The United States and Europe have imposed strict sanctions on Russia over the past two years. But an illicit network of traders and smugglers, working with the assistance of shadowy financial firms, has been helping Russia gain access to banned products that it needs to restock its military arsenal.

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