Russian police detained Leonid Gozman, an opposition politician, on Monday, his lawyer said, after a criminal case was opened over his alleged failure to inform the authorities swiftly enough about his citizenship of Israel. “At the entrance to the Frunzenskaya metro station, he was detained by metro police officers,” Gozman’s lawyer, Mikhail Biryukov, said on Facebook. Gozman was the last leader of the small Union of Right Forces political party, which brought together free-market reformers such as Anatoly Chubais, who has left Russia, and Boris Nemtsov, who was shot dead in 2015 close to the…