Vladimir Putin is a threat to Asia. Let me explain why. His invasion of Georgia in 2008 and now Ukraine are blatant acts of aggression. Placing troops in Crimea is a violation of the sovereignty of another nation and reflects a desire on the part of Putin to re-establish some sense of preeminence enjoyed by the Soviet Union before its breakup. Of course, the referendum in Crimea last weekend dresses up Russian actions in the language of self-determination, but this is a blatant violation of international rules and norms.