US submarine armed with 'low-yield' nuclear weapon, Pentagon says

The US Defense Department announced Tuesday that it has deployed a submarine carrying a new long-range missile with a relatively small nuclear warhead, saying it is in response to Russian tests of similar weapons. The move is a significant change in US defense posture that has raised concerns it could elevate the risk of a nuclear war. Critics worry that small nukes would be more likely to be used because they cause less damage, thereby lowering the threshold for nuclear conflict.

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