The United States should not ...

The United States should not jump around like an elephant frightened by a mouse.
 George F. Kennan

Quotes from the same author

The truth is sometimes a poor competitor in the market place of ideas – complicated, unsatisfying, full of dilemmas, always vulnerable to misinterpretation and abuse.
 George F. Kennan
A foreign policy aimed at the achievement of total security is the one thing I can think of that is entirely capable of bringing this country to a point where it will have no security at all.
 George F. Kennan