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.
SALEM, NH - FEBRUARY 08: Republican presidential candidate Donald Trump speaks to a small crowd a day before voters go to the polls on February 8, 2016 in Salem, New Hampshire. Trump, who came in second place in Iowa despite leading in the polls, is looking to for a win on Tuesday in the New Hampshire primary. (Photo by )
<> on March 26, 2014 in Seoul, South Korea. North Korea test-launched two Nodong ballistic missiles into the East Sea in the morning of March 26, 2014, according to South Korea's military report.
TOPSHOT - ADDITION-
People watch a news report on North Korea's first hydrogen bomb test at a railroad station in Seoul on January 6, 2016. South Korea "strongly" condemned North Korea's shock hydrogen bomb test and vowed to take "all necessary measures" to penalise its nuclear-armed neighbour. The image shown on TV shows files images from other nuclear tests from other countries and the caption in red at the bottom of the screen reads "the Blue House will convene an emergency meeting of the NSC, the National Security Council." AFP PHOTO / JUNG YEON-JE / AFP / JUNG YEON-JE (Photo credit should read JUNG YEON-JE/AFP/Getty Images)
Iranian technicians remove a container of radioactive uranium, 'yellow cake', sealed by the International Atomic Energy Agency, to be used at the Isfahan Uranium Conversion Facilities (UCF), 420 kms south of Tehran, 08 August 2005. Iran looked set to resume sensitive nuclear fuel work imminently after the arrival of UN inspectors at a uranium conversion plant, a move that would put it on a collision course with the West. AFP PHOTO/BEHROUZ MEHRI (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)
A Palestinian girl dressed as Santa Claus prays at the Latin Church in the West Bank village of Zababdah, near Jenin on December 24, 2011. The Latin Patriarch of Jerusalem Fuad Twal calls for reconciliation in Syria, Egypt, Iraq and North Africa in the text of a speech published ahead of delivery at midnight mass. AFP PHOTO/SAIF DAHLAH (Photo credit should read SAIF DAHLAH/AFP/Getty Images)
CHICAGO, IL - SEPTEMBER 09: of the Chicago Bears of the Indianapolis Colts during their 2012 NFL season opener at Soldier Field on September 9, 2012 in Chicago, Illinois. (Photo by Jonathan Daniel/Getty Images)
BRIDGWATER, ENGLAND - MARCH 10: A masked protester stands in front of flags at the gates to the Hinkley Point nuclear power station to mark the first anniversary of the Fukushima disaster in Japan on March 10, 2012 near Bridgwater, England. Protestors planned to blockade the site at Hinkley, which is located on the Bristol Channel and has been earmarked for a potential new nuclear power station, for 24 hours starting today. (Photo by Matt Cardy/Getty Images)
WASHINGTON, DC - MAY 19: Democratic Conference Vice Chairman Sen. Charles Schumer (D-NY) talks to reporters after the weekly Democratic policy luncheon at the U.S. Capitol May 19, 2015 in Washington, DC. Senate Minority Leader Harry Reid (D-NV) has said he supports Schumer becomiing the next Senate Democratic leader after Reid retires in 2017. (Photo by Chip Somodevilla/Getty Images)
HIROSHIMA, JAPAN - AUGUST 06: Japanese people pray for atomic bomb victims in front of a Atomic Bomb Dome at the Hiroshima Peace Memorial Park on the day of the 68th anniversary of the atomic bombing of Hiroshima on August 6, 2013 in Hiroshima, Japan. Japan marks the 68th anniversary of the first atomic bomb that was dropped on Hiroshima by the United States on August 6, 1945, killing an estimated 70,000 people instantly with many thousands more dying over the following years from the effects of radiation. Three days later another atomic bomb was dropped on Nagasaki, ending World War II. (Photo by Buddhika Weerasinghe/Getty Images)
