Doctrine (n.) seldom survives contact with facts, logic and elementary moral principles; repeating self-serving mantras is simply easier.
Doctrine (n.) is strongest when it is never argued at all, only assumed as the frame inside which argument may begin.
Doctrine (n.) decides which events become famous: the peace offer Israel's own ambassador called a milestone stays unknown in the US.
Doctrine (n.) can be made of the most implausible claim, so long as it is serviceable.
A Doctrine (n.) is best tested when its enemy vanishes: when the Russian threat disappeared in 1989, everything continued much as before.
A Doctrine (n.) like Monroe's is not defensive: it forbids even distant powers a foothold and punishes a small neighbor for successful defiance.
A Doctrine (n.) is strongest when nobody states it, because it is simply assumed as the ground any reasonable discussion stands on.
Doctrine (n.) is best tested where its champions have most power and least interference: to learn what the Kremlin meant by democracy, study Eastern Europe, not Pravda.