President Barack Obama’s advice to the world that it shouldn’t “assume the worst” about Donald Trump may apply to countries whose existential interests cannot be threatened by the president-elect’s policies, but those that face a possible Russian invasion must assume and prepare for the worst.

They cannot, as Obama recommended, “wait until the administration is in place” and then “make your judgments as to whether or not it’s consistent with the international community’s interest in living in peace and prosperity together.”

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