UN human rights experts are calling for hundreds more political prisoners to be freed following the massive prisoner exchange between Russia, the United States and other Western countries. Between 700 and 1,372 people are still being held in Russia on false or politically motivated charges, according to a joint statement released on Friday by experts working for the UN Human Rights Council in Geneva. The group welcomed the release of 16 people who had been imprisoned for their activities as journalists, artists, opposition members or activists. In return, 10 people were handed over to Russia, …