Allies such as Germany and Poland are lobbying for tougher penalties against Russia's nuclear energy industry.

After Moscow's invasion of Ukraine, the European Union is looking for new measures to affect the Kremlin's finances, and Germany, Poland, and a few other EU members are lobbying for restrictions on Russian nuclear energy.

As retaliation for Russia's aggression against Ukraine, the 27 European countries have banned its seaborne oil and coal exports and drastically reduced their purchases of natural gas from Moscow. However....