South Korea’s military scrambled fighter jets and attack helicopters on Monday after five North Korean drones crossed into its airspace, with one aircraft crashing, according to the country’s defense ministry.On Tuesday, South Korean President Yoon Suk Yeol said the incident showed that the military’s “readiness and training has been very lacking,” and that South Korea would expedite the launch of its military drone unit in response.The secretive country usually test-launches its missiles in this way, firing them at a lofted angle so that they land in the waters between the Korean Peninsula and Japan.And last week, Kim Yo Jong, Kim Jong Un’s sister and a top official in the regime, claimed in state media that North Korea was ready to test-fire an intercontinental ballistic missile (ICBM) at a normal trajectory, a flight pattern that could prove the weapons can threaten the continental United States.North Korea has been developing its nuclear missile forces in violation of United Nations Security Council resolutions, ramping up its activities since the last of three meetings in 2019 between Kim Jong Un and then-US President Donald Trump failed to yield any agreement."