South Korean soldiers fired warning shots after North Korean troops crossed the land border earlier this week, South Korean military said on Tuesday.

South Korea’s Joint Chiefs of Staff reported that some North Korean soldiers, who were engaged in unspecified activities on their side of the border, briefly crossed the military demarcation line on Sunday. After South Korea’s military fired warning shots and issued warning broadcasts, the North Korean soldiers returned to their territory.

The Joint Chiefs of Staff also stated that North Korea had not conducted any other suspicious activities.

The border between the Koreas, filled with mines, is the most heavily fortified in the world, with hundreds of thousands of combat troops on each side. This situation is a legacy of the 1950-53 Korean War, which ended with an armistice rather than a peace treaty.

This border incident occurred amid increasing tensions over North Korea’s recent launches of balloons carrying waste.

North Korea sending trash balloons to South Korea

Earlier this week, North Korea had sent hundreds of balloons filled with trash across the border. The two neighbors have been in a balloon barrage for a while sending trash and propaganda across their heavily fortified border.

North Korea sent the trash-filled balloons after South Korean activists sent their balloons filled with propaganda leaflets to the North.

Balloon wars origin

The balloon wars originated during the Korean War (1950-53) and persisted throughout the Cold War era. Both North and South Korea used balloons to spread propaganda and psychological messages to each other.

During the Cold War, North and South Korea engaged in a propaganda battle, broadcasting anti-government messages and launching balloons filled with leaflets into each other’s airspace. These leaflets often contained defamatory content, which both governments prohibited their citizens from reading.

In the 1990s and 2000s, as North Korean propaganda lost its influence and South Korea’s economy flourished, the South embraced democracy while North Korea maintained strict control over information. Despite a 2000 agreement to cease government-sponsored propaganda, North Korean defectors and Christian activists in the South continued to send balloons carrying Bibles, transistor radios, medicines, and leaflets critical of the North Korean regime.

(With inputs from PTI)