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Operation Weasel is the name given to an alleged secret operation involving the governments of Nauru, New Zealand and the United States.

The exact nature of the operation, if it did indeed exist, is subject to disagreement — most accounts link it to investigations into the sale of Nauruan passports, the defection of North Korean scientists to the West, or both. This was a classic example of what is known as a Barium Meal - a spy tactic of feeding sufficiently important intelligence (traceable but false) to suspects to find leaks.