South Korea scrambled about 80 military aircraft, including advanced F-35 fighter jets, on Friday after tracking about 180 flights by North Korean warplanes inside North Korean territory in what appeared to be a defiant show of strength.

North Korea’s mobilization of warplanes came after it test-fired around 30 ballistic missiles over the previous two days, including an intercontinental ballistic missile on Thursday that triggered evacuation warnings in Japan, in an angry response to ongoing joint exercises by hundreds of U.S. and South Korea military planes.

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South Korea’s Joint Chiefs of Staff said the North Korean warplanes were detected in various areas inland and along the country’s eastern and western coasts, but did not come particularly close to the Koreas’ border. The South Korean military spotted about 180 flight trails from 1 to 5 p.m., but it wasn’t immediately clear how many North Korean planes were involved and whether some may have flown more than once.

Read more: AP