Experts say Donald Trump's position on nuclear proliferation would be a disaster

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Trump on Changing Nuclear Policy with Japan

Donald Trump recently suggested that if he won the US presidency, he might allow Japan and South Korea to develop their own nuclear weapons arsenal in exchange for an ease in US defense commitments.

Experts told Business Insider that his position would be dangerous.

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Jeffrey Lewis, the director of the East Asia Nonproliferation Program at the Middlebury Institute of International Studies, said Japan building nuclear weapons would be a "total catastrophe for Japan and US nuclear power programs."

"Early on we thought nuclear weapons are great when our allies have them and bad when our enemies have them," Lewis said.

He explained:

Everybody has a friend. And so if you can give them the path of saying it's good when our allies have them and bad when our enemies have them, you get to the point where everybody has them. It's better to have a system ... in which we say no more nuclear-weapons states and try to maintain that.

Japan and South Korea obtaining nuclear weapons could have a domino effect around the world as other countries, including some US allies in the Middle East, demand their own arsenal.

"A large number of our other allies would want the same treatment immediately. Probably lots of Middle Eastern states," Lewis said. "I think you would get a lot of countries wanting nuclear weapons."

Related: Take a look at North Korea's nuclear facility and test site:

15 PHOTOS
North Korea Punggye-ri Nuclear facility
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Experts say Donald Trump's position on nuclear proliferation would be a disaster
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - DECEMBER 12th, 2015: Figure 1B. Dual mining cart tracks established at new tunnel site. Date: December 12, 2015. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - DECEMBER 12th, 2015: Figure 2B. Activity at the North Portal spoil pile. Date: December 12, 2015. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 27th, 2015: Figure 2a. No camouflage covering the West Portal tunnel entrance at the Punggye-ri Nuclear Test Site in North Korea. Date: March 27, 2015. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 27th, 2015: Figure 6a. Construction material visible at the Main Support Area at the Punggye-ri Nuclear Test Site in North Korea. Date: March 27, 2015. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MAY 16, 2015: Figure 1. Low level of activity at the West Portal at the Punggye-ri Nuclear Test Site in North Korea. Date: May 16, 2015 (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MAY 16, 2015: Figure 5. Areas that have been logged at the Punggye-ri Nuclear Test Site in North Korea. Date: May 16, 2015. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - APRIL 9th, 2015: New Nuclear Test Tunnel Under Construction at North Koreas Punggye-ri. Figure 2. Construction related to a new portal at North Koreas nuclear test site. Photo date: April 9, 2015. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MAY 16, 2015: Figure 6b. An old building has been re-roofed and a new building has been erected at the Main Support Area at the Punggye-ri Nuclear Test Site in North Korea. Date: May 16, 2015 (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MAY 31, 2010: Figure 2A. DigitalGlobe imagery of the West Portal of the Punngye Nuclear Facility in May 2010. Published on 38 North. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - FEBRUARY 11, 2015: Figure 5A. The adjacent pad has been paved. Date: February 11, 2015 -- published on 38 North. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - JANUARY 11, 2015: Figure 4A. Pavement installed around the large domed building. Date: January 11, 2015 -- published on 38 North. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - JANUARY 11, 2015: Figure 2B. The South Tunnel Portal in deep shadow. Date: January 11, 2015 -- published on 38 North. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - JANUARY 11, 2015: Figure 1B. Construction in January at the West Portal. Date: January 11, 2015 -- published on 38 North. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - JANUARY 11, 2015: Figure 3B. Little activity at the Main Support Area. Note: image rotated. Date: January 11, 2015 -- published on 38 North. (Photo DigitalGlobe/38 North via Getty Images)
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Kingston Reif, the director for Disarmament and Threat Reduction Policy at the Arms Control Association, made a similar point.

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"If South Korea and Japan were to acquire their own nuclear deterrents, that would send an incredibly dangerous signal to our allies in the Middle East," he told Business Insider. "It would be incredibly destabilizing development," he added.

Trump explained his stance on expanding the number of nuclear powers a New York Times interview that was published over the weekend. The Republican presidential frontrunner said "at some point," the US "cannot be the policeman of the world," referring to its commitments to contribute to the defense of its allies.

He said while the "biggest problem" in the world is nuclear proliferation, he might be open to allowing Japan and South Korea to have their own nuclear arsenals in exchange for the US contributing less to their defense. Both countries are threatened by North Korea, a dictatorship that has been developing nuclear capabilities.

BI Graphic_The World's NukesReuters/Joshua Roberts

"Would I rather have North Korea have [nuclear weapons] with Japan sitting there having them also?" Trump told The Times. "You may very well be better off if that's the case. In other words, where Japan is defending itself against North Korea, which is a real problem. You very well may have a better case right there."

But Reif called this 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 said.

And Trump's potential plan wouldn't be likely to accomplish much. Reif pointed out that despite the fact India and Pakistan's nukes haven't stopped the aggression between them. And Israel's arsenal hasn't stopped it from being threatened.

So even with the nuclear threats from North Korea, it's unlikely that additional nukes in surrounding countries would ease tensions.

"This idea that this would bring more security to Japan and South Korea than the US troops deployed there and the US defense commitment to those countries is not borne out by the evidence," Reif said.

Lewis said Trump's plan "would sound half-clever if he was sitting on a bar stool."

"We tried to let the Japanese defend themselves at one point," Lewis said. "It did not go well."

He noted that even if the US were to allow Japan to build nuclear weapons, it's unlikely the country would want to.

This was affirmed by the Japanese government on Monday. The country's Chief Cabinet Secretary Yoshihide Suga told reporters that Japan's commitment to not owning, making, or allowing nuclear weapons "remain an important basic policy of the government," according to The Associated Press.

But South Korea might be a different story. Polls show that there has been growing public support in the country for establishing an independent nuclear arsenal. If South Korea were to revise its position on nonproliferation, it could have far-reaching consequences.

"This would further reduce the likelihood of achieving a nuclear-free Korean peninsula," Reif said. "Right now that prospect seems pretty distant, but it would likely be closed off for good if South Korea were to get its own deterrent."

Aside from the Korean peninsula and the Middle East, China might also look to get more even more nuclear weapons if there were a buildup in South Korea and Japan.

China militaryReuters/Joshua Roberts

China's "doctrine regarding when it might employ nuclear weapons might be described as one of minimum deterrence," Reif said. "China right now is believed to have no more than 300 total nuclear weapons, which is a small arsenal relative to what the US and Russia possess."

He continued:

But in the event that South Korea and Japan acquire independent nuclear weapons, it's highly likely that China would revisit its minimum deterrence posture and likely accelerate its ongoing nuclear modernization efforts and consider increasing the overall size of its nuclear arsenal.

Lewis further cautioned that having several nuclear-weapons states in northeast Asia could be dangerous.

"It would be a free-for-all," he said. "It would be a giant science experiment that I would not want to see."

The US might also expect to see a conventional military buildup from China as well if other countries in the region obtained nukes, according to Reif.

The US is already contending with China's military buildup in the South China Sea, where China is laying claim to strategically significant island chains. The country wants to build military outposts on the islands that would give it greater control of the waters surrounding the mainland.

"If we think that the military buildup in the region is concerning now, just wait to see what happens in the event that South Korea or Japan get their own nuclear deterrents," Reif said. "That's likely to increase the threat that China poses to the US and its allies in the region."

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