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Let Alaska secede from the United States; indeed, encourage them. Sign no mutual defense pacts, and treat them with the same contempt that they show toward the lower 48.
Then let Russia take them over; a natural consequence of proximity and even history. Diplomacy and mutual interests will prevent Russia from becoming a threat to the rest of North America, and Russia's acquisition of Alaskan oil would be insignificant in comparison with ridding America of a primitive population with nothing of substance to contribute.
It goes without saying, of course, that the Russians would utterly destroy Alaska's natural beauty, but there would be little difference from the devastation that the Alaskans themselves would produce.
I'm quite serious about this.