Ukrainian band, Kalush Orchestra, made an impassioned plea to free people still trapped in a besieged steel mill in a Ukrainian port city on Saturday night after performing in the final of the Eurovision Song Contest, where bookmakers tip them to win. The band's frontman said: “I ask all of you, please help Ukraine, Mariupol. Help Avostal, right now." The plea gave served as a somber reminder that the hugely popular and at times flamboyant Eurovision song contest was being played out against the backdrop of a war on Europe’s eastern flank. President Volodymyr Zelenskyy gave sig...