China and Vietnam have had major wars over little pieces of rock and we've got much more substantial disputes coming down the road as we speak.

We're not talking about separating two combatants, we're talking about engaging a combatant, to use deadly force, to ensure the security of the societies we're protecting.

Some issues go beyond rationality. Any sign of an affront to northern sovereignty is absolutely guaranteed to get on the front page of all the newspapers.

I think there is going to be a certain amount of second-guessing when the actual price tag of these various promises come in.