Is A Blockade The Ultimate In Buy-Local?

Thinking more about this post from last year.

If buy-local is such a boon for the locality (whatever that may be in a given situation), why do the recipients/victims of a blockade respond to it as an act of war instead of thanking the blockaders?

“When country A enacts a blockade or economic sanctions against country B, does country B become more prosperous or less? Does country B thank country A for the good fortune of being forced to “buy local,” or does it claim that country A has committed an act of war?”