Barricades are placed near the Unification Bridge, which leads to the Panmunjom in the Demilitarized Zone in Paju, South Korea, Tuesday, June 11, 2024. South Korean soldiers fired warning shots after North Korean troops briefly violated the tense border earlier this week, South Korea's military said Tuesday, as the rivals are embroiled in Cold War-style campaigns like balloon launches and propaganda broadcasts. (AP Photo/Lee Jin-man)