Russian opposition leader Alexei Navalny could have been included in a prisoner swap between Moscow and the West if he had not died in prison on Feb. 16, U.S. National Security Advisor Jake Sullivan said at a briefing on Aug. 1. Independent experts and Western politicians say that Russian dictator Vladimir Putin is personally responsible for Navalny’s death. Some argue that Navalny was killed intentionally, while others say he died due to harsh conditions and lack of medical treatment. Sullivan’s statement came after amajor prisoner exchange that involved 26 people from seven countries — U.S.,…