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As Russia's Ukraine war intensifies, some warn nuclear escalation is possible

03:49
A 2020 test of a ground-based intercontinental ballistic missile from the Plesetsk facility in northwestern Russia. Russia has the world's largest nuclear arsenal. (AP)
A 2020 test of a ground-based intercontinental ballistic missile from the Plesetsk facility in northwestern Russia. Russia has the world's largest nuclear arsenal. (AP)

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