A simulation called "Plan A" produced by researchers shows how the use of one so-called tactical or low-yield nuclear weapon could lead to a terrifying worldwide conflict. In the roughly four-minute video, a Russian "nuclear warning shot" at a US-NATO coalition is followed by a tactical nuke that leads to a global nuclear war. "This project is motivated by the need to highlight the potentially catastrophic consequences of current US and Russian nuclear war plans. The risk of nuclear war has increased dramatically in the past two years," the project states on its website. The following shows how a NATO-Russia conflict involving a nuclear warning shot and the use of a tactical nuclear weapon could quickly escalate into a full-scale nuclear war.

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