North Korea fired short-range missiles this past weekend, just days after the sister of Kim Jong Un threatened the United States and South Korea for holding joint military exercises. Lee Jin-man/AP hide caption
ballistic missiles
Troops prepare for the military parade marking the 70th anniversary of the founding of the People's Republic of China on Tuesday in Beijing. Visual China Group via Getty Images hide caption
This photo released by the U.S. Defense Department shows the launch of a conventionally configured ground-launched cruise missile at San Nicolas Island, Calif., on Sunday. U.S. Department of Defense hide caption
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
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