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Ballistic-missile submarines like the USS Alaska form one leg of America's nuclear triad, which enables striking from land, sea and air.   © U.S. Navy/Reuters

Holes forming in US nuclear umbrella, some in Japan argue

Ex-defense minister floats possibility of hosting American nukes

| North Korea

TOKYO -- Debate is growing in Japan over whether the American commitment to defend allies with nuclear force will hold as Washington's own defense interests loom larger, and whether stationing nuclear weapons here could shore up this key deterrence strategy.

The cure

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