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 hide caption
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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 hide caption
Iran's military says its Khorramshahr missile has a range of 2,000 kilometers (1,243 miles) and can carry multiple warheads. Tasnim News Agency hide caption
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 hide caption
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. KCNA/Reuters hide caption
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 hide caption
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 hide caption
People watch a TV screen showing North Korean leader Kim Jong Un during a news program, at Seoul Railway Station in Seoul on Tuesday. Ahn Young-joon/AP hide caption