US President Joe Biden. File photo MOSCOW, June 8 US President Joe Biden has confirmed his participation in the NATO summit, which will be held in Madrid at the end of June, said Spanish Defense Minister Margarita Robles. «Biden confirmed his presence,» Robles said in an interview with Cadena Ser radio station. She also noted that «Sweden, Finland, Australia, New Zealand and South Korea» confirmed their participation. The NATO summit will be held in Madrid on June 28-30.Turkey saw Sweden and Finland as a threat to NATO