South Korean President Yoon Suk-you asked for international support Sunday from the U.S. and Japan amid more "hostile" nuclear and missile programs from North Korea.

Yoon addressed President Joe Biden and Japanese Prime Minister Fumio Kishida on the sidelines of a summit of the Association of Southeast Asian Nations (ASEAN) in Phnom Penh, Cambodia.

South Korea President Yoon Suk-yeol
South Korea's President Yoon Suk-yeol attends the ASEAN summit held in Phnom Penh, Cambodia November 11, 2022. Cindy Liu/Reuters

Yoon said in his remarks, "North Korea is conducting more hostile and aggressive provocations based on confidence over its nuclear and missile capabilities."

He also stressed the importance of strengthening deterrent strategies amid North Korea's growing threats, saying he wanted to show Pyongyang that it would not be successful in its attempt to intimidate South Korea.

North Korea has been testing missiles offshore at an unprecedented pace, including a possible failed intercontinental ballistic missile (ICBM) launch earlier this month. South Korea fears Pyongyang could prepare for its first nuclear device test since 2017.

On Saturday, Yoon proposed Japan and China begin a trilateral dialogue to address security issues amid the testing.

He also urged international leaders to respond to North Korean aggression with one, strategic voice, including seeking economic support for North Korea if they decided to denuclearize.

Yoon is expected to meet with Japanese Kishida in Phnom Penh at the ASEAN summit. He will also meet with Biden and have a trilateral dialogue with both leaders on Sunday.

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