Can you please provide evidence and details of this claim, provided you do not source a Russian-controlled media outlet?
http://rt.com/news/154580-journalist-ntv-russian-ukraine/
http://www.kyivpost.com/content/ukraine/russian-journalists-denied-entry-in-ukraine-342442.html
http://www.rferl.org/content/russian-journalists-detained-in-ukraine-released/25352470.html