Seoul: South Korea's military fired warning shots after several North Korean soldiers briefly crossed the border on June 18, when 20 to 30 North Korean soldiers crossed the border early morning, the third such incident this month, Al Jazeera reported.

The Joint Chiefs of Staff (JCS) said the incident occurred on Thursday when the North Korean soldiers crossed the Military Demarcation Line running through the middle of the Demilitarized Zone (DMZ) at about 11 am (02:00 GMT).

JCS said on Friday, "After our military's warning broadcasts and warning shots, the North Korean soldiers retreated back northwards."

According to Al Jazeera, similar incidents occurred on Tuesday and June 9, both times involving North Koreans who quickly retreated after South Korea fired warning shots. Seoul stated that these incursions seemed accidental.

Nuclear-armed North Korea has deployed more soldiers and equipment to the border since abandoning a 2018 military agreement when South Korea suspended parts of the deal in response to Pyongyang's successful launch of its first military spy satellite.

According to Seoul, they have been expanding tactical roads and laying more landmines, which have led to "casualties" as a result of accidental explosions.

The incident took place as Russian President Vladimir Putin visited Pyongyang for the first time in 24 years and the two countries signed a mutual defense pact that has raised alarm in Seoul, Tokyo, and Washington, as per Al Jazeera.

On Friday, South Korea's Foreign Minister Cho Tae-yul and United States Secretary of State Antony Blinken condemned the treaty as a serious threat to the peace and stability of the region.

South Korea's Ministry of Foreign Affairs summoned Russian ambassador Georgy Zinoviev to lodge an official protest over the pact, which states that if either of the two is invaded or put in a state of war, the other side will provide military and other assistance "with all means" at its disposal and "without delay."

Zinoviev said he told the ministry that threats and blackmail against Russia over its increasingly close ties to North Korea were unacceptable.

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