A Moscow  court  on Thursday upheld five-and-a-half year prison sentences for four Russian journalists, including two former Deutsche Welle reporters who previously worked for the organization's Moscow bureau.  Konstantin Gabov and Sergey Karelin, along with Antonina Favorskaya and Artyom Kriger, were convicted in April  on charges of participating in an "extremist organization" — a reference to the Anti-Corruption Foundation (FBK), an NGO founded by opposition leader Alexei Navalny .  Navalny,