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Several fan accounts dedicated to the Grammy nominee shared a video of a Times Square billboard congratulating the singer on her Lifetimes tour, which launched on April 23 in Mexico City.

Her comments came after fans paid for a billboard in New York to show their support for her ahead of her world tour.

"In city centres, everything is covered with Russian propaganda: billboards with Putin's face, Putin's quotes, people they call heroes of the special military operation. There are flags everywhere," she tells the BBC.

Among billboards for restaurants, gun silencers and tractors, a digital sign hints at the crisis gripping the community: a warning about the dangers of measles, which can cause complications including pneumonia, brain swelling and death.

Yet large numbers of posters and billboards for Oligui Nguema dominate Libreville's streets, with very few of his rivals' adverts visible.