Putin prepares for nuclear explosion, NATO holds largest drills | Will Europe witness a nuclear war?

As the war in Ukraine continues, NATO has kicked off its largest military drills all across Eastern Europe, Russia has been busy training its forces for a nuclear explosion as it tests an advanced simulator.
Why is NATO conducting its largest military drills right in the face of Russia? Why does Russia need a realistic nuclear explosion simulator? Are these indications that the next nuclear war is likely to take place in Europe?
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