António Guterres, the Secretary-General of the United Nations, warned earlier this year that nuclear war is "again within the range of possibility."
Russia has claimed in the past that its new missiles could destroy several American cities.
In the event of a nuclear strike by Russia, the state of North Dakota or the state of Montana would presumably be the primary targets.
In response to Russia's threat, the UN secretary-general said that nuclear war is once again "within the range of possibility."
With the situation in Ukraine threatening to bring NATO into direct battle with Russia, the country placed its nuclear weapons on alert early this year.
Since then, worries that a nuclear bomb would be deployed have been exacerbated by ongoing nuclear threats.