Russian operatives are laying the groundwork for what could be a stronger push to support candidates who oppose aiding Ukraine, or who call for pulling the United States back from NATO and other alliances, U.S. officials and independent researchers say.

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The loosely linked “Doppelgänger” creates fake versions of real news websites in the United States, Israel, Germany and Japan, among other countries. It often promotes websites previously associated with Russia’s military intelligence agency, known as the G.R.U.

So always check your links, and pick Democrats up and down the ballot over the Republicans who are going along with Russian aims.