President-elect Donald Trump signaled Thursday that he will look to "strengthen and expand" the US's nuclear capability hours after Russian President Vladimir Putin pledged to enhance his country's nuclear forces.
The exchange appeared to raise the prospect of a new arms race between the two nuclear superpowers, which between them boast more than 14,000 nuclear warheads, the still deadly legacy of their four-decades long Cold War standoff.
But the comments by Putin, who is presiding over a project to restore Russia's lost global power and influence, and Trump, who will shortly become the US commander-in-chief, did not spell out exactly what each side is proposing or whether a major change of nuclear doctrine is in the offing.
Trump weighed in with a tweet just hours after Putin spoke following a meeting with his military advisers to review the activity of the past year.
"The United States must greatly strengthen and expand its nuclear capability until such time as the world comes to its senses regarding nukes," Trump wrote.
On Friday, Putin downplayed the risk of a new nuclear arms race between Russia and the US and said there was "nothing new" in Trump's tweet.
"During his election campaign, (Trump) said US needs to bolster nuclear capabilities and armed forces in general and there is nothing new," Putin said at this annual news conference.
It was not immediately clear if the President-elect is proposing an entire new nuclear policy that he would begin to flesh out once he takes office next year.
Trump could also be referring to plans to modernize the current US nuclear arsenal that are currently underway and will cost hundreds of billions of dollars. The Obama administration has outlined a plan to modernize delivery systems, command and control systems and to refurbish warheads in the US nuclear triad -- the US force of sea, airborne and missile delivered nuclear weapons.