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Donald Trump has called for the US to "greatly strengthen and expand" its nuclear arsenal.
The president-elect, who takes office next month, said the US must take such action "until such time as the world comes to its senses regarding nukes".
He spoke hours after President Vladimir Putin said Russia needs to bolster its military nuclear potential.
The US has 7,100 nuclear weapons and Russia has 7,300, according to the US nonpartisan Arms Control Association.
The president-elect, who takes office next month, said the US must take such action "until such time as the world comes to its senses regarding nukes".
He spoke hours after President Vladimir Putin said Russia needs to bolster its military nuclear potential.
The US has 7,100 nuclear weapons and Russia has 7,300, according to the US nonpartisan Arms Control Association.