South Korea’s president warned North Korea against using its nuclear arsenal while publicly parading its most powerful ballistic missile this week.

Relations between the Koreas remain strained, with North Korea conducting missile tests and South Korea increasing military exercises with the United States.

SEOUL, South Korea (AP) — North Korean leader Kim Jong Un threatened to use nuclear weapons and destroy South Korea permanently if provoked, state media reported Friday, after the South’s leader warned that Kim’s regime would collapse if he attempted to use nuclear arms.