We can only guess how the decision was made for Russia to ban food imports from most of the Western world, but perhaps it went something like this:

President Vladimir Putin was sitting with some of his old pals from his KGB days. Putin was desperate for a way to retaliate against the West for its economic sanctions leveled against Russia for intervening to help the rebels in Ukraine. He asked for suggestions.

"Why not a boycott of their food?" suggested a former Soviet general, remembering the grain embargoes of the...