The Russian embassy in Berlin said on Saturday it had received hundreds of complaints during the past three days from Russians in Germany saying they had received threatening messages. Cars with Russian registration plates have been damaged, and Russian school pupils have reported insults, hate speech, bullying and physical assault. “We hold all manifestations of discrimination and infringement of the rights of our citizens and the Russian-speaking population in Germany to be unacceptable,” the embassy said. Russia’s Interfax news agency reported that Ambassador Sergej Nechayev had sent a memo…