Jeffrey Lewis is director of the East Asia Nonproliferation Program for the James Martin Center for Nonproliferation Studies at the Middlebury Institute of International Studies at Monterey.
HENDON, ENGLAND - MAY 05: Prime Minister David Cameron speaks to staff at Utility Warehouse on May 5, 2015 in Hendon, England. Campaigning has intensified in the last few days before voters go to the polls in a general election on May 7, 2015. (Photo by Rob Stothard/Getty Images)
People walk past a television screen reporting news of North Korea's latest Musudan missile test, at a railway station in Seoul on June 23, 2016.
North Korean leader Kim Jong-Un has hailed the successful test of a powerful new medium-range missile, saying it poses a direct threat to US military bases in the Pacific, state media reported on June 23. / AFP / JUNG YEON-JE (Photo credit should read JUNG YEON-JE/AFP/Getty Images)
DALLAS, TX - AUGUST 29: Texas Governor Rick Perry speaks at the Defending the American Dream Summit sponsored by Americans For Prosperity at the Omni Hotel on August 29, 2014 in Dallas, Texas. Included to speak at the eighth annual summit are U.S. Senators Rand Paul and Ted Cruz as the summit will run until August 30th. (Photo by Mike Stone/Getty Images)
GRAND RAPIDS, MI - DECEMBER 9: President-elect Donald Trump looks on during a rally at the DeltaPlex Arena, December 9, 2016 in Grand Rapids, Michigan. President-elect Donald Trump is continuing his victory tour across the country. (Photo by Drew Angerer/Getty Images)
A Russian Yars RS-24 intercontinental ballistic missile system drives during the Victory Day military parade in Moscow on May 9, 2015. Russian President Vladimir Putin presides over a huge Victory Day parade celebrating the 70th anniversary of the Soviet win over Nazi Germany, amid a Western boycott of the festivities over the Ukraine crisis. AFP PHOTO / POOL / HOST PHOTO AGENCY RIA NOVOSTI (Photo credit should read -/AFP/Getty Images)
A woman watches a television screen showing an image of Kim Jong Un, leader of North Korea, center, during a news broadcast on North Korea's nuclear test at Gimhae International Airport in Busan, South Korea, on Friday, Sept. 9, 2016. North Korea conducted its fifth nuclear test on Friday, the anniversary of the reclusive nation's founding, and said it was now able to produce miniaturized nuclear arms. Photographer: SeongJoon Cho/Bloomberg
ADANA, TURKEY - JULY 18: A picture taken on July 18, 2016 in Incirlik, Adana, Turkey shows a general view from Incirlik 10th Adana Tanker Base Commander while Adana public prosecutor's office is conducting research and investigation in the base after the Parallel State/Gulenist Terrorist Organization's failed military coup attempt. (Photo by Yusuf Koyun/Anadolu Agency/Getty Images)
MILWAUKEE, WI - NOVEMBER 10: Presidential candidate Donald Trump gestures after Carly Fiorina says she met with Russian President Putin at a one on one meeting, during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
ADANA, TURKEY - JULY 24: A military aircraft of Turkish Air Force lands at the Incirlik 10th Tanker Base Command in Saricam district, Adana on July 24, 2015. On Friday, Turkish F-16 fighter jets hit three Daesh targets in Syria in the morning. Turkish jets carried out the operation without violating the Syrian airspace, according to a statement by the Prime Ministry. (Photo by Ibrahim Erikan/Anadolu Agency/Getty Images)
WASHINGTON, DC - SEPTEMBER 09: Republican presidential candidate Donald Trump (2nd L) talks with journalists during a rally against the Iran nuclear deal on the West Lawn of the U.S. Capitol September 9, 2015 in Washington, DC. Thousands of people gathered for the rally, organized by the Tea Party Patriots, which featured conservative pundits and politicians. (Photo by Chip Somodevilla/Getty Images)
ISE, JAPAN - MAY 26: (L to R) U.S. President Barack Obama walks with Japanese Prime Minister Shinzo Abe on the Ujibashi bridge as they visit at the Ise-Jingu Shrine on May 26, 2016 in Ise, Japan. In the two-day summit, the G7 leaders are scheduled to discuss global issues including counter-terrorism, energy policy, and sustainable development. (Photo by Chung Sung-Jun/Getty Images)
Seen through the legs of a Russian soldier a RS-24 Yars thermonuclear intercontinental ballistic missile launcher rolls at a strategic missile forces base near the town of Teykovo, some 200 km northeast of Moscow, on September 22, 2011, with the boots. Russian strategic missile forces started to replace the mobile version of the Topol-M intercontinental ballistic missiles with an advanced Yars model in 2009, the Russian media reported. AFP PHOTO / ANDREY SMIRNOV (Photo credit should read ANDREY SMIRNOV/AFP/Getty Images)
A fully armed F-16 fighter jet is pictured at the military base of the 10th Tactical Wing, in Kleine Brogel, Peer, on March 21, 2011. Six Belgian F-16 fighter jets will be active in the ongoing military operations in Libya. AFP PHOTO/BELGA /YORICK JANSENS =Belgium Out= (Photo credit should read YORICK JANSENS/AFP/Getty Images)
