Three years of war, and a now-collapsing vital bridge. For Ukraine, the transition from the Biden administration to the Trump era could be summed up in a few words: from mobilization to the risk of being abandoned. From empathy to contempt. From tailored support to overt pressure. The new president's eagerness to impose peace is fraught with threats for Ukraine, which cannot do without Washington's support. But a "pax Americana," essentially dictated to Moscow without regard for the victim, would be a pivotal tragedy, adding to all the sacrifices made to defend Ukraine's national sovereignty and territory, already fractured by Crimea's annexation in 2014 and the invasion of 2022.

For three years, the US has stood by Ukraine. Initially surprised by its resistance and the Russian army's setbacks, Joe Biden then endeavored to mobilize its allies in support of Volodymyr Zelensky and his people. But the veteran Democrat, intellectually forged by the Cold War, also set limits because of his one fear: that of a conflict between great nuclear powers that would extend beyond the Ukrainian borders.

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