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Claim
Uranium Resources Inc. (URRE), a Colorado company which specializes in mining a key element necessary to make many nuclear warheads, rose 19.27% in Thursday afternoon trading to $1.30 a share after Donald Trump tweeted the U.S. should expand its nuclear capability.

The United States must greatly strengthen and expand its nuclear capability until such time as the world comes to its senses regarding nukes  — Donald J. Trump (@realDonaldTrump) December 22, 2016

Trump's tweet followed a speech by Russian President Vladimir Putin in Moscow on Thursday that took an aggressive stance regarding his country's nuclear stockpile.

"We need to strengthen the military potential of strategic nuclear forces, especially with missile complexes that can reliably penetrate any existing and prospective missile defense systems," Putin said, according to an AFP translation of the event.

Russia (7,300 weapons) and the United States (6,970) have the world's largest nuclear weapons stockpiles by a wide margin, data collected by the Ploughshares Fund - a nuclear nonproliferation nonprofit - shows (source)

Putin answer to WSJ
Nathan Hodge: On a personal level, what interests me is the production of new kinds of nuclear weapons. We know of course how hard it is, since nuclear tests are banned. Perhaps you simply could not help but respond to Mr Trump’s statement yesterday on nuclear weapons?

Vladimir Putin: Regarding the US President-elect, Mr Trump, there is nothing new here. On the campaign trail he talked about the need to strengthen the US nuclear capability and armed forces. So there is nothing unusual here.

Honestly, I was quite surprised by statements coming from other official representatives of the current administration, who for some reason started to argue that the United States has the most powerful army in the world. But nobody suggested otherwise.

If you listened carefully to what I said yesterday, I talked about strengthening the nuclear triad and in conclusion said that the Russian Federation was stronger than any potential – and this is key – aggressor. This is a very important point, and not an incidental one.

What does it mean to be an aggressor? An aggressor is someone who can attack the Russian Federation. We are stronger than any potential aggressor. I have no problem repeating it.

I also said why we are stronger. This has to do with the effort to modernise the Russian Armed Forces, as well as the history and geography of our country, and the current state of Russian society. There are a whole host of reasons, not least the effort to modernise the Armed Forces, including both conventional weapons and the nuclear triad.

I must say, and this is no secret, we have nothing to hide, that indeed, we have put a lot of effort into modernising Russia’s nuclear missile potential, and our Armed Forces. This also applies to our Strategic Missile Forces, which are deployed on land; this concerns our sea-based forces; this is all open information, we are not hiding anything. We are deploying new strategic nuclear submarines with new types of missiles on board. This also applies to our air forces. I am referring to both the carriers, i.e. the aircraft, and the strike systems they have under their wings. We operate in strict compliance — I would like to emphasize this — in strict compliance with all of our agreements, including START-3.

Once again, allow me to repeat something I consider extremely important. In 2001, the United States unilaterally withdrew from the ABM Treaty. This agreement was certainly the cornerstone of the entire international security system. We were told then, “We are not doing this against you, while you…” I said, “We will have to react somehow, we will need to improve our strike systems in order to defeat these missile defense systems.” And they said, “Well, you can do whatever you want, we will proceed from the idea that you are not doing it against us.” So that’s what we’re doing. Although many prefer to ignore this fact, but this is exactly what we have basically agreed to, tacitly, without signing any documents. So nothing new is happening here.

So why are current US officials suddenly claiming that they are the strongest and the most powerful? Yes, indeed, they do have more missiles, submarines and aircraft carriers. We will not even argue with that. We are saying that we are simply stronger than any aggressor. And this is true. (source)(video).