Moscow - Russian President Vladimir Putin vowed to punish the killers of Kremlin critic Boris Nemtsov as opposition figures denounced what they called a "political murder" and Western leaders called for a full probe.
The 55-year-old former deputy premier, a vocal Putin critic prominent at opposition rallies, was shot in the back several times just before midnight Friday as he walked across a bridge a stone's throw from the Kremlin walls.
The brazen assassination is the latest in a string of murders of opposition figures in Putin's 15 years in power and recalls the shooting of anti-Kremlin reporter Anna Politkovskaya, gunned down on Putin's birthday in October 2006.