The scenes of social unrest and violence at the weekend are an ominous portent, ahead of elections which may deliver a far-right presidency

In Emmanuel Macron’s book Revolution, published ahead of the 2017 presidential election that he went on to win, he promised to restore hope to a country that was losing faith in its future. As Mr Macron’s lame-duck second term enters its last phase against a quasi-insurrectionary backdrop of torched public buildings and looted shops, the failure of that political project appears total.

The worst scenes of urban violence for years overshadowed a weekend of protest that gravely undermined what is left of the French president’s authority. As police lost control of the streets, more than 2,000 shops were ransacked. Far-left groups targeted town halls and local buildings, and engaged in pitched battles with the police, whose disastrously heavy-handed response to last week’s high school protests has succeeded only in escalating tensions.

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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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