Military and defense

A young girl watches as North Korean men and women take part in a mass dance on Tuesday, April 25, 2017, in Pyongyang, North Korea. Pyongyang residents hold mass dances across the city to mark the 85th anniversary of the country's army. Despite deepening tensions on the Korean Peninsula, and reports of a major military drill on the country's east coast, the North's capital was quiet. (AP Photo/Eric Talmadge)

Chief nuclear negotiators from left to right, Joseph Yun, U.S. special representative for North Korea policy, Kenji Kanasugi, director general of the Japanese Foreign Ministry's Asian and Oceanian Affairs Bureau, and Kim Hong-kyun, special representative for Korean Peninsula peace and security affairs at the South Korean Foreign Ministry, join hands before their meeting about North Korean issues at the Iikura Guesthouse in Tokyo Tuesday, April 25, 2017. North Korea marks the founding anniversary of its military on Tuesday, and South Korea and its allies are bracing for the possibility that it could conduct another nuclear test or launch an intercontinental ballistic missile for the first time. (Toru Yamanaka/Pool Photo via AP)

Chief nuclear negotiators from left to right, Joseph Yun, U.S. special representative for North Korea policy, Kenji Kanasugi, director general of the Japanese Foreign Ministry's Asian and Oceanian Affairs Bureau, and Kim Hong-kyun, special representative for Korean Peninsula peace and security affairs at the South Korean Foreign Ministry, join hands before their meeting about North Korean issues at the Iikura Guesthouse in Tokyo Tuesday, April 25, 2017. North Korea marks the founding anniversary of its military on Tuesday, and South Korea and its allies are bracing for the possibility that it could conduct another nuclear test or launch an intercontinental ballistic missile for the first time. (Toru Yamanaka/Pool Photo via AP)

Chief nuclear negotiators from left to right, Joseph Yun, U.S. special representative for North Korea policy, Kenji Kanasugi, director general of the Japanese Foreign Ministry's Asian and Oceanian Affairs Bureau, and Kim Hong-kyun, special representative for Korean Peninsula peace and security affairs at the South Korean Foreign Ministry, join hands before their meeting about North Korean issues at the Iikura Guesthouse in Tokyo Tuesday, April 25, 2017. North Korea marks the founding anniversary of its military on Tuesday, and South Korea and its allies are bracing for the possibility that it could conduct another nuclear test or launch an intercontinental ballistic missile for the first time. (Toru Yamanaka/Pool Photo via AP)

The nuclear-powered submarine USS Michigan approaches to join the U.S. aircraft carrier USS Carl Vinson in drills near the Korean Peninsula, at Busan port in Busan, South Korea, Tuesday, April 25, 2017. North Korea marks the founding anniversary of its military on Tuesday, and South Korea and its allies are bracing for the possibility that it could conduct another nuclear test or launch an intercontinental ballistic missile for the first time. (Jo Jung-ho/Yonhap via AP)

The nuclear-powered submarine USS Michigan approaches to join the U.S. aircraft carrier USS Carl Vinson in drills near the Korean Peninsula, at Busan port in Busan, South Korea, Tuesday, April 25, 2017. North Korea marks the founding anniversary of its military on Tuesday, and South Korea and its allies are bracing for the possibility that it could conduct another nuclear test or launch an intercontinental ballistic missile for the first time. (Jo Jung-ho/Yonhap via AP)

FILE - In this Friday, April 7, 2017, file photo, U.S. President Donald Trump, left, and Chinese President Xi Jinping pause for photographs at Mar-a-Lago in Palm Beach, Fla. North Korea often marks significant dates by displaying military capability, and South Korean officials say there's a chance the country will conduct its sixth nuclear test or its maiden test launch of an ICBM around the founding anniversary of its military on Tuesday, April 25. Trump spoke by phone with both the Japanese and Chinese leaders Monday, April 24. China's official broadcaster CCTV quoted Xi telling Trump that China strongly opposed North Korea's nuclear weapons program and hoped "all parties will exercise restraint and avoid aggravating the situation." (AP Photo/Alex Brandon, File)

FILE - In this Friday, April 7, 2017, file photo, U.S. President Donald Trump, left, and Chinese President Xi Jinping pause for photographs at Mar-a-Lago in Palm Beach, Fla. North Korea often marks significant dates by displaying military capability, and South Korean officials say there's a chance the country will conduct its sixth nuclear test or its maiden test launch of an ICBM around the founding anniversary of its military on Tuesday, April 25. Trump spoke by phone with both the Japanese and Chinese leaders Monday, April 24. China's official broadcaster CCTV quoted Xi telling Trump that China strongly opposed North Korea's nuclear weapons program and hoped "all parties will exercise restraint and avoid aggravating the situation." (AP Photo/Alex Brandon, File)