Considering Russia just recently snached an Ukrainian soldier Nadezhda Savchenko from Ukraine (who had previously been taken hostage by Donbass separatists), they really have no higher ground to stand on.
Two wrongs don't make a right. This is Kindergarten level stuff.
dublinben is right, but wasn't this soldier snatched by the separatists and not .ru govt? At least with a quick google search I can't find anything saying otherwise.