The US often sends powerful warplanes in times of heightened animosities with North Korea, and flew B-1B bombers several times this year as the North conducted a series of banned ballistic missile tests.
Today's flights by B-1Bs came shortly after the death of a US college student who was recently released by North Korea in a coma following more than 17 months of captivity.
Seoul's Defense Ministry said the bombers engaged in routine exercises with South Korean fighter jets aimed at showing deterrence against North Korea.
The United States stations tens of thousands of troops in South Korea and Japan.
The family of American college student Otto Warmbier said the 22-year-old died yesterday, days after his release from North Korea. Analysts say his death will likely cast a shadow on relations between the US and North Korea and compound efforts by South Korea's new liberal president, Moon Jae-in, to improve ties with the North.
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