CNN said Thursday a Ukrainian journalist working for the US news channel had been abducted this week by pro-Russian separatists, and appealed for his release. On its website, CNN said journalist Anton Skiba was taken on Tuesday by armed men from the self-declared Donetsk People’s Republic. Skiba had been working as a freelancer with a CNN crew covering the crisis in Ukraine. CNN said it did not report the abduction at the time while making efforts to obtain his release.