In a photo provided by the South Korea Air Force, two U.S. Air Force B-1B bombers, top left, fly over the Korean Peninsula with South Korean Air Force F-35A fighter jets, F-16 fighter jets and U.S. Air Force F-16 fighter jets during joint aerial drills by South Korea and the United States, at an undisclosed location in South Korea, April 15, 2025. South Korea Air Force/AP

The United States flew long-range B-1B bombers in a show of force against North Korea on Tuesday, days after the powerful sister of North Korean leader Kim Jong Un vowed to resist a U.S.-led push to eliminate the North's nuclear program. North Korea often reacts to the U.S. deployment of B-1B bombers and other powerful military assets with missile tests and fiery rhetoric.

Tuesday's flyover of the U.S. bombers could draw an angrier response because it happened when North Korea was marking a key anniversary - the 113th birthday of state founder Kim Il Sung, the late grandfather of the country's current leader.

South Korea's Defense Ministry said in a statement that the U.S. bombers participated in a South Korea-U.S. aerial drill meant to strengthen the allies' combined operational capability and demonstrate their deterrence capability against North Korea's advancing nuclear program.

The ministry said South Korean F-35 and F-16 fighter jets and American F-16 fighter jets also took part in the training over the Korean Peninsula. It said South Korea and the U.S. will continue to expand their joint military exercises to respond to North Korean nuclear threats.

It was the second time a U.S. B-1B had participated in a drill with South Korea since President Trump began his second term in January. In February, North Korea's Defense Ministry slammed the B-1B's earlier flyover as proof of intensifying U.S.-led provocations since Mr. Trump's inauguration. It pledged to counter the strategic threat of the U.S. with strategic means. Days later, North Korea test-fired cruise missiles in what it called an attempt to show its nuclear counterattack capability.

Mr. Trump has repeatedly said he will reach out to Kim Jong Un to revive diplomacy. North Korea hasn't directly responded to the U.S. leader's outreach.

Last Wednesday, Kim Yo Jong — Kim's sister and a senior official — derided the U.S. and its Asian allies over what she called their "daydream" of denuclearizing North Korea, insisting that her country will never give up its nuclear weapons program. Her statement came as a response to a recent meeting among the top diplomats of the United States, South Korea and Japan where they reaffirmed their commitment to push for North Korea's denuclearization.

In March, amid mounting tension with the U.S. over Pyongyang's nuclear ambitions and alignment with Russian President Vladimir Putin as he wages war on Ukraine, North Korea's defense ministry reiterated Kim's stated goal of "radical growth" of the North's nuclear force — to counter what he claims is a growing threat from the U.S. and its Asian allies.

The Kim Il Sung birthday, called "the Day of Sun," is one of the most important holidays in North Korea, where a state-sponsored cult of personality treats key members of the ruling Kim family like gods. On Tuesday, the country's main Rodong Sinmun newspaper issued an editorial urging the public to rally behind Kim Jong Un to achieve a national prosperity. In recent days, North Korea has held seminars, performances and other events commemorating the founder's achievements.

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