Before leaving for home after the Group of 20 summit, President Barack Obama sat down with Russian civil society activists on Friday evening to assure them that he would keep pressing Moscow to respect human rights, some of the activists said. But Obama also explained to them why this wasn't always possible. The meeting was held several hours after two dozen of gay activists rallied in St. Petersburg to protest Russia's new law banning gay propaganda, which prompted some activists to call for the boycott of the 2014 Winter Games in Sochi. Igor Kochetkov, the head of LGBT Network, who...