Russia wants America and China to decide Ukraine’s future without Kyiv. Europe must challenge this dangerous return to diplomacy of the strong for the strong

Does Vladimir Putin know exactly how to play Donald Trump? The history of chummy phone calls, high-profile meetings and attempts to bring Russia in from the cold certainly suggests that Moscow’s thuggish ruler has a hold on this American president. If Mr Trump agrees to negotiate Ukraine’s future with Mr Putin and China’s Xi Jinping without Ukraine at the table, he will have handed the Russian leader a victory before talks begin. The message will be that strongmen are ruling the world and determining the fate of weaker nations.

Ukraine has the right to determine its future. That right cannot be waved away by a self-serving Russian proposal, however much it indulges Mr Trump’s belief that world affairs should be settled by powerful men. The scales are falling from European eyes. Trumpian America is raising doubts about whether it will help deter aggression or even honour its Nato commitments. If Washington now rewards Moscow and pressures Ukraine to accept a raw deal, it would be a betrayal. European governments would wonder where America might be in the future when their own security is threatened.

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