SEOUL, SOUTH KOREA - JUNE 03: Sung Kim, U.S. Special Envoy for North Korea, speaks during a meeting with his South Korean counterpart Kim Gunn and Japanese counterpart Takehiro Funakoshi at the Foreign Ministry on June 03, 2022 in Seoul, South Korea. The top nuclear envoys of South Korea, the United States and Japan are set to hold a meeting in Seoul on Friday to discuss the security situation on the Korean Peninsula amid reports that North Korea has completed preparations for another nuclear test. (Photo by Kim Hong-Ji - Pool/Getty Images)

SEOUL, South Korea (AP) — President Joe Biden’s special envoy for North Korea is monitoring North Korean arrangements for a possible nuclear test explosion that outside officials say could be imminent. The envoy said Friday the United States is “preparing for all contingencies” in close coordination with its South Korean and Japanese allies. American diplomat Sung Kim was in Seoul for a trilateral meeting with his South Korean and Japanese counterparts to discuss the growing threat posed by North Korea’s nuclear weapons and ballistic missiles program. North Korea has ramped up missile tests in 2022, exploiting a favorable environment to push forward weapons development as the United Nations Security Council remains divided over Russia’s war on Ukraine.