US Ambassador to France Charles Kushner gives a news conference marking the 250th birthday of the US in 2026, in Paris, December 4, 2025. CHRISTOPHE ENA / AP

The US ambassador to Paris, Charles Kushner, called France's foreign minister on Tuesday, February 24, and pledged not to "interfere" in the host country's affairs, a diplomatic source said, after a fallout over Washington's remarks following the killing of a far-right activist.

The new diplomatic row between the two NATO allies broke out after Kushner flouted a summons over the US administration denouncing what it called "terrorism" and left-wing violence in France after the fatal beating of far-right activist Quentin Deranque, 23, earlier this month.

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Who was Quentin Deranque, the far-right activist killed in Lyon?