North Korea again started UAVs to South Korea. Why today it disturbs all

For the first time since 2017 some started North Korea thrones crossed border with South Korea. About it reported South Korean agency "Renkhap". According to the representative of the Joint committee of chiefs of staffs, the Korean armed forces found a set of "unknown objects" in the territory South Korea up to vicinities Seoul. South Korea alarmed fighters, helicopters and anti-aircraft weapons for interception of thrones, and also made precautionary shots. One of the alarmed South Korean fighters Ka-1 was wrecked. As "Renkhap" reports...