SEOUL, South Korea -- The U.S military says two nuclear-capable B-2 bombers have completed a training mission in South Korea amid threats from North Korea that include nuclear strikes on Washington and Seoul.

The statement Thursday by U.S. Forces Korea is an unusual confirmation. It follows an earlier U.S. announcement that nuclear-capable B-52 bombers participated in ongoing U.S.-South Korean military drills.

The U.S. says the B-2 stealth bombers flew from a U.S. air base and dropped munitions on a South Korean island range before returning home.

The announcement will likely draw a strong response from Pyongyang. North Korea sees the military drills as part of a U.S. plot to invade and becomes particularly upset about U.S. nuclear activities in the region.

Washington and Seoul say they the annual drills are routine and defensive.

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  • In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un greets military personnel at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea boarder in North Korea near the South's western border island of Baengnyeong. (AP Photo/KCNA via KNS)

  • In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un waves at military officers after inspecting the Wolnae Islet Defense Detachment, North Korea, near the western sea border with South Korea. (AP Photo/KCNA via KNS)

  • In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un, center, confers with military officers at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea border in North Korea near the South's western border island of Baengnyeong. (AP Photo/KCNA via KNS)

  • In this undated photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un, second left, watches sturgeons in a pond at the Ryongjong Fish Farm in South Hwanghae, southwestern North Korea. (AP Photo/KCNA via KNS)

  • In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un rides on a boat, heading for the Wolnae Islet Defense Detachment, North Korea, near the western sea border with South Korea. (AP Photo/KCNA via KNS)

  • In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un, third left, looks at South's western border island of Baengnyeong during his visit to the Wolnae Islet Defense Detachment, North Korea. (AP Photo/KCNA via KNS)

  • In this March 7, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 8, 2013 by the Korea News Service, North Korean leader Kim Jong Un, center, is welcomed by military personnel at a military unit on Jangjae islet, located in the southernmost part of the southwestern sector of North Korea's border with South Korea. (AP Photo/KCNA via KNS)

  • In this March 7, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 8, 2013 by the Korea News Service, North Korean leader Kim Jong Un, center, walks with military personnel as he arrives for a military unit on Mu Islet, located in the southernmost part of the southwestern sector of North Korea's border with South Korea. (AP Photo/KCNA via KNS)

  • In this March 7, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 8, 2013 by the Korea News Service, North Korean leader Kim Jong Un, center, uses binoculars to look at the South's territory from an observation post at the military unit on Jangjae islet, located in the southernmost part of the southwestern sector of North Korea's border with South Korea. (AP Photo/KCNA via KNS)

  • In this March 7, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 8, 2013 by the Korea News Service, North Korean leader Kim Jong Un, with military officials, gets a ride on a boat on his way to a military unit on Jangjae Islet, located in the southernmost part of the southwestern sector of North Korea's border with South Korea. (AP Photo/KCNA via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) meeting with family of a soldier as he inspects Jangjae Islet Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) inspecting Jangjae Islet Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) waving to soldiers from a wooden boat as he inspects the Mu Islet Hero Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) meeting with family of a soldier as he inspects Jangjae Islet Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) inspecting Jangjae Islet near from South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) inspecting the Mu Islet Hero Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)

  • This picture, taken by North Korea's official Korean Central News Agency on March 7, 2013 shows North Korean leader Kim Jong Un (C) posing with soldiers and their family members as he inspects Jangjae Islet Defence Detachment near South Korea's Taeyonphyong Island in South Hwanghae province, North Korea's southwestern sector of the front. (KCNA/AFP/Getty Images via KNS)