South Korean President Moon Jae-in (left) and North Korean leader Kim Jong Un shake hands after signing a joint declaration at the Paekhwawon State Guesthouse in Pyongyang, North Korea, on Wednesday.
Pyongyang Press Corps Pool via AP
Pakistan test fires its new Ababeel surface-to-surface ballistic missile in Pakistan on Jan. 24, 2017. Ababeel has a maximum range of 1,350 miles and is capable of delivering multiple warheads using multiple independent re-entry vehicle technology, according to Pakistani sources.
Anadolu Agency/Getty Images
Missiles on display in northern Tehran in 2014. A reported missile test by Iran on Sunday has led some American officials to accuse the country of violating a U.N. resolution that accompanied the 2015 nuclear deal.
Atta Kenare/AFP/Getty Images
North Korean leader Kim Jong Un looks at a warhead component being developed for a ballistic missile, at an unidentified location in this undated photo released by North Korea's Korean Central News Agency on March 15, 2016.
A man looks at a television reporting on North Korea's missile launching in Tokyo. North Korea test-fired what appeared to be two medium-range Musudan missiles in quick succession.
Kazuhiro Nogi/AFP/Getty Images
A MiG-21 fighter — a leftover monument from the Soviet era — is the centerpiece of the Aviators Neighborhood in Deveselu, Romania. Now the base has become a U.S. Navy facility that is part of NATO's anti-missile shield for Europe.
Gabriel Amza for NPR