Disarmament

FILE- In this combination of file photos, U.S. President Donald Trump, left, in the Oval Office of the White House in Washington on May 16, 2018, and North Korean leader Kim Jong Un in a meeting with South Korean leader Moon Jae-in in Panmunjom, South Korea, on April 27, 2018. With the next meeting between the two leaders set for Feb. 27-28 in Vietnam, there’s hope and caution in South Korea on whether the leaders could agree to tangible steps toward reducing the North’s nuclear threat after a year of soaring but fruitless talks. (AP Photo/Evan Vucci, Korea Summit Press Pool via AP, File)

President Donald Trump delivers his State of the Union address to a joint session of Congress on Capitol Hill in Washington, Tuesday, Feb. 5, 2019. (AP Photo/J. Scott Applewhite)

FILE - In this Nov. 13, 2015 file photo, Costa Rican 1987 Nobel peace laureate and former president of Costa Rica, Oscar Arias, looks at the media during the opening ceremony of the XV World Summit of Nobel Peace Laureates at the University in Barcelona, Spain. Arias has been accused of sexual assault by a nuclear disarmament activist, a charge he denies. She filed a criminal complaint on Monday, Feb. 4, 2019. (AP Photo/Manu Fernandez, File)

U.S. Special Representative for North Korea Stephen Biegun, left, talks with South Korean National Security Director Chung Eui-yong during a meeting at the Presidential Blue House in Seoul, South Korea, Monday, Feb. 4, 2019. Biegun and South Korean officials met Sunday to discuss an expected second summit between President Donald Trump and North Korean leader Kim Jong Un. (South Korea Presidential Blue House via AP)

President Donald Trump speaks during a meeting with American manufacturers in the Oval Office of the White House, Thursday, Jan. 31, 2019, in Washington. (AP Photo/Jacquelyn Martin)

FILE - In this Oct. 26, 2010 file photograph, a worker rides a bicycle in front of the reactor building of the Bushehr nuclear power plant, just outside the southern city of Bushehr. Iran's deputy foreign minister said Thursday, Jan 31, 2019, that he believes European Union nations soon will announce they've created a program for Iran to continue trade there and avoid re-imposed U.S. sanctions over its nuclear program. (AP Photo/Mehr News Agency, Majid Asgaripour, File)

Director of National Intelligence Daniel Coats testifies before the Senate Intelligence Committee on Capitol Hill in Washington Tuesday, Jan. 29, 2019. (AP Photo/Jose Luis Magana)

CIA Director Gina Haspel accompanied by FBI Director Christopher Wray and Director of National Intelligence Daniel Coats testifies before the Senate Intelligence Committee on Capitol Hill in Washington Tuesday, Jan. 29, 2019. (AP Photo/Jose Luis Magana)

FILE - In this Sept. 11, 2018 file photo, Iran's nuclear chief Ali Akbar Salehi speaks in an interview with The Associated Press at the headquarters of Iran's atomic energy agency, in Tehran, Iran. Salehi told Iranian state television on Sunday, Jan. 13, 2019 that the Islamic Republic has begun "preliminary activities for designing" a modern process for 20-percent uranium enrichment for its 50-year-old research reactor in Tehran, signaling new danger for the nuclear deal. (AP Photo/Vahid Salemi, File)

U.S. Secretary of State Mike Pompeo, center walks with Vice Adm. James Malloy, commander of the U.S. Naval Forces Central Command/5th Fleet, after a tour of the U.S. Naval Forces Central Command center in Manama, Bahrain, Friday, Jan. 11, 2019. (Andrew Caballero-Reynolds/Pool Photo via AP)