The U.S. special envoy for North Korea said Monday that Washington and Seoul agreed on the need for a strong response to Pyongyang’s recent spate of missile tests, though they remain open to dialogue with the country.

Sung Kim flew to South Korea on for talks two days after North Korea conducted a new type of missile test in its 13th round of weapons firing this year. Experts say North Korea wants to advance its weapons arsenal and wrest concessions like sanctions relief from its rivals.

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U.S. Special Representative for North Korea, Sung Kim, left, is escorted by South Korea's Special Representative for the Korean Peninsula Peace and Security Affairs Noh Kyu-duk during a meeting at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

The U.S. special envoy for North Korea said Monday that Washington and Seoul agreed on the need for a strong response to Pyongyang’s recent spate of missile tests, though they remain open to dialogue with the country.

U.S. Special Representative for North Korea, Sung Kim, left, watches as South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk speaks during a briefing at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

“We agreed on the need for a strong response to the destabilizing behavior we have seen from” North Korea, Kim told reporters after a meeting with his South Korean counterpart. “(We) also agreed on the need to maintain the strongest possible joint deterrent capability on the peninsula.”

U.S. Special Representative for North Korea, Sung Kim, left, speaks as South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk listens during a briefing at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

North Korea has so far rejected Kim’s outreach, saying the United States must first drop its hostile policy before talks can resume. Some experts say North Korea wants the U.S. to relax sanctions or suspend its regular military drills with South Korea, which it views as an invasion rehearsal.

South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk, right, speaks as U.S. Special Representative for North Korea, Sung Kim, listens during a briefing at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

Last month, North Korea test-fired an intercontinental ballistic missile potentially capable of reaching the U.S. homeland in its first long-range weapons test since November 2017.

Protesters stage a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. (AP PhotoAhn Young-joon)

Protesters stage a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. (AP PhotoAhn Young-joon)

Protesters carry a banner during a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. (AP PhotoAhn Young-joon)

Protesters carry a banner during a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. (AP PhotoAhn Young-joon)

Protesters stage a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. The signs read "Stop the joint military exercises between South Korea and the United States." (AP PhotoAhn Young-joon)

Protesters stage a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. The signs read "Stop the joint military exercises between South Korea and the United States." (AP PhotoAhn Young-joon)

Weapons tested include nuclear-capable missiles targeting both the U.S. mainland and its allies such as South Korea and Japan. There are concerns that North Korea may conduct a nuclear test soon to intensify its pressure campaign.

U.S. Special Representative for North Korea, Sung Kim, left, is escorted by South Korea's Special Representative for the Korean Peninsula Peace and Security Affairs Noh Kyu-duk during a meeting at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

U.S. Special Representative for North Korea, Sung Kim, left, is escorted by South Korea's Special Representative for the Korean Peninsula Peace and Security Affairs Noh Kyu-duk during a meeting at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

“We agreed on the need for a strong response to the destabilizing behavior we have seen from” North Korea, Kim told reporters after a meeting with his South Korean counterpart. “(We) also agreed on the need to maintain the strongest possible joint deterrent capability on the peninsula.”

South Korean nuclear envoy Noh Kyu-duk said he and Kim shared concerns that North Korea will likely continue to engage in acts that raise regional tensions. He urged North Korea to return to talks.

Kim said the allies “have not closed the door on diplomacy” with North Korea and have “no hostile intents toward” the country. He repeated his earlier statement that the United States is ready to meet North Korea “anywhere, without any conditions.”

U.S. Special Representative for North Korea, Sung Kim, left, watches as South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk speaks during a briefing at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

U.S. Special Representative for North Korea, Sung Kim, left, watches as South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk speaks during a briefing at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

North Korea has so far rejected Kim’s outreach, saying the United States must first drop its hostile policy before talks can resume. Some experts say North Korea wants the U.S. to relax sanctions or suspend its regular military drills with South Korea, which it views as an invasion rehearsal.

Earlier Monday, the U.S. and South Korean militaries kicked off their springtime computer-simulated command post exercise. North Korea has previously responded to such drills with missile tests and warlike rhetoric.

North Korea said Sunday it tested a new tactical guided weapon a day earlier, which would boost its nuclear fighting capability. Some analysts said the weapon is likely a short-range ballistic missile to be mounted with a tactical nuclear warhead that targets South Korea.

U.S. Special Representative for North Korea, Sung Kim, left, speaks as South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk listens during a briefing at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

U.S. Special Representative for North Korea, Sung Kim, left, speaks as South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk listens during a briefing at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

Last month, North Korea test-fired an intercontinental ballistic missile potentially capable of reaching the U.S. homeland in its first long-range weapons test since November 2017.

U.S.-led diplomacy meant to convince North Korea to abandon its nuclear ambitions in return for economic and political rewards remain largely stalemated since 2019.

South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk, right, speaks as U.S. Special Representative for North Korea, Sung Kim, listens during a briefing at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk, right, speaks as U.S. Special Representative for North Korea, Sung Kim, listens during a briefing at the Foreign Ministry in Seoul, South Korea, Monday, April 18, 2022. (AP PhotoAhn Young-joon, Pool)

Protesters stage a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. (AP PhotoAhn Young-joon)

Protesters stage a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. (AP PhotoAhn Young-joon)

Protesters carry a banner during a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. (AP PhotoAhn Young-joon)

Protesters carry a banner during a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. (AP PhotoAhn Young-joon)

Protesters stage a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. The signs read "Stop the joint military exercises between South Korea and the United States." (AP PhotoAhn Young-joon)

Protesters stage a rally to oppose the joint military exercises between South Korea and the United States near the presidential Blue House in Seoul, South Korea, Monday, April 18, 2022. South Korea's military said Sunday that its nine-day springtime drills with the United States will start on Monday. The signs read "Stop the joint military exercises between South Korea and the United States." (AP PhotoAhn Young-joon)