Emmanuel Macron, the French President, warned of an "existential risk" to the European Union as he waded into the European election campaign ahead of a knife-edge vote between his centrist party and the far-right.
French presidents, as guardians of the Republic, are nominally supposed to remain above the fray in national elections but the unwritten rule is regularly flouted.
Macron had already lent his face to campaign posters, replacing that of the lacklustre head of his party's campaign, former Europe minister Nathalie Loiseau. He also met candidates on his La République en Marche! party's Renaissance list.
But he went further with a lengthy, joint interview published in regional French newspapers.
"I cannot be a spectator, but a participant in what is the most important European election since 1979, because the union is facing an existential risk," Macron said, adding that his rivals - chief among them Marine Le Pen, the leader of the far-right National Rally - had turned the election into a "referendum" for or against his two-year-old presidency.