A possible victory by Le Pen, a Putin sympathizer, could destabilize the Western coalition against Moscow, upending France’s role as a leading European power and potentially giving other NATO leaders cold feet about staying in the alliance, according to three senior administration officials not authorized to publicly discuss private conversations.

Senior U.S. officials have warily watched across the Atlantic for any signs of possible Russian interference in the first round of the elections, which will take place Sunday. Polls suggest that Macron and Le Pen would likely then advance to a showdown on April 24 — and that the potential two-person race would be close…

Though Le Pen styles herself a benign populist, her campaign platform on immigration and Islam are still radical, with plans to ban the veil from all public places and stop foreigners from enjoying the same rights as French citizens. Her surname, in certain circles, is synonymous with racism and xenophobia — she now fronts the far-right, anti-immigration party her father founded. And she has been an unabashed admirer of Putin, whom she met in Moscow in 2017. Though she has somewhat distanced herself from the Russian president since the invasion of Ukraine, she has spoken sympathetically of Putin’s rationale for war and rejected some of the Western coalition’s hard-line measures against Russia.