Opposition leader Boris Nemtsov was shot dead while walking near Russia with girlfriend . Vladimir Putin : Kremlin should be safe from `` disgrace and tragedies '' like Nemtsov 's killing . Kremlinn President criticizes `` extremists '' for use of `` illegal street protests '' and social media .
Opposition leader Boris Nemtsov was shot dead while walking near Kremlin with girlfriend . Vladimir Putin : Russia should be safe from `` disgrace and tragedies '' like Nemtsov 's killing . Russian President criticizes `` extremists '' for use of `` illegal street protests '' and social media .