The Greatest Geopolitical Catastrophe of the Century

Which of these was, according to Putin, was The Greatest Geopolitical Catastrophe of the Century?

• The starvation of 7 million Ukrainians under Stalin's forced collectivization program?
• Mao's Great Leap Forward, which starved tens of millions of Chinese?
• Hitler's murder of 6 million Jews, 3 million Soviet prisoners of war, and countless others?
• The inability of the United Nations and national governments to prevent the killing of 800,000 people in Rwanda?
  
• The fall of the Soviet Union?

No points for guessing, but jeez, whatta Maroon.