The DPRK's foreign ministry warned last week that Pyongyang might end the scheduled working-level negotiations with Washington if the planned South Korea-U.S. military drills happen.

The presidential Blue House of South Korea said in a statement that it was closely managing situations relevant to the DPRK's "short-range missile" launches through the National Security Office (NSO) crisis management center.

South Korean President Moon Jae-in was briefed on it immediately after the launches, the Blue House said.

The South Korean government had closely monitored situations as it recognized the relevant situations "in advance," and it was running a rapid response system among relevant ministries.

According to local media reports, the military authorities of South Korea and the United States spotted signs of the preparation for the DPRK's projectile firings two weeks ago.

The Blue House said the intelligence authorities of South Korea and the United States were precisely analyzing the DPRK's short-range missiles.

The NSO meeting will be held later in the day to discuss the DPRK's missile firings, the Blue House added.

Lee Do-hoon, South Korea's special representative for Korean Peninsula peace and security affairs, held phone talks with Stephen Biegun, U.S. special representative for DPRK affairs, and Kenji Kanasugi, director general of Asian and Oceanian affairs bureau at Japan's foreign ministry, according to Seoul's foreign ministry.

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