President-elect Donald Trump turned to Twitter on Thursday to call for the US to increase the capability of its nuclear arsenal.
"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 the social media platform.
Russia on Thursday also called for strengthening "the military potential of strategic nuclear forces" in the country.
Trump's proclamation comes one day after he met with top Pentagon officials, including the Air Force deputy chief of staff for strategic deterrence and nuclear integration, a post that broadly oversees the Air Force's nuclear weapons capabilities.
He tweeted after the Wednesday meeting that he was impressed with the people he met.
Earlier this year, the Obama administration proposed a $348 billion plan to upgrade the US nuclear arsenal over the next 10 years to improve the missiles and warheads and improve delivery systems aboard submarines and aircraft.
Trump's tweet wasn't the first time he's promoted expanding nuclear weapons broadly.
During the presidential campaign, Trump said he could support countries like Japan and South Korea developing their own nuclear weapons, a move that many experts said could create a strategic arms race in Asia and the Middle East.
Kingston Reif, the director for disarmament and threat-reduction policy at the Arms Control Association, called Trump's pro-proliferation stance "irresponsible."
"The US needs to be playing an even more active role than it is currently playing in reducing nuclear buildup, and Trump's comments will not make that job any easier," Reif told Business Insider in March.
Trump's position on nuclear weapons has been inconsistent.
He said during the campaign that he wants to be "unpredictable" in his decisions regarding nuclear weapons, but has also said that he would like "everybody to end it, just get rid of" nuclear weapons. He said in September that "once the nuclear alternative happens, it's over," but that he still didn't want to "take anything off the table."
And last month, he tweeted that he "never said" that more countries should acquire nuclear weapons.