Russia is “ready” to discuss a prisoner swap with Washington at the presidential level, its foreign minister said on Friday, a day after the drug conviction of US basketball star Brittney Griner. “We are ready to discuss this subject, but only within the framework of the (communication) channel established by presidents Putin and Biden,” Sergei Lavrov told a press conference on a visit to Cambodia. “There is a special channel established by the presidents and despite certain public declarations, it is still functional,” he said. “If the Americans again decide to engage in public diplomacy and …