"The correspondent was working amid a standup, cutting a famous Kyiv cake with a table knife. At that moment he was blocked by an identified person who made the local police detain NTV's employee," the channel said.

According to the source, the detainee is now being interrogated by the SBU Security Service of Ukraine.

Read alsoUkraine deports Russian journo, cites national security concerns"Nemyshev is now being questioned by SBU officers who have arrived at the police station," it said.

According to other Russian news outlets, Nemyshev was found in possession of so-called "DPR" [the self-proclaimed Donetsk People's Republic] accreditation, which led the police to invite the Ukrainian Security Service.