South Korea's military has scrambled dozens of jets after detecting the mobilisation of 180 North Korean warplanes moving near the border between the two countries.
"Our military detected around 180 North Korean warplanes" mobilised in Pyongyang's airspace, Seoul's Joint Chiefs of Staff said.
They said that Seoul "scrambled 80 fighter jets including F-35As" while jets involved in the joint drills were also "maintaining readiness".