North Korea fired at least 23 missiles into the ocean on Wednesday — including one that landed less than 40 miles from the South Korean coastline.

South Korean President Yoon Suk-yeol described the provocation as “territorial encroachment.”

The ballistic barrage made for the largest number of North Korean missiles ever fired in a single day — and the closest a missile from the North had landed to the South since the Korean war.

The missile landed just outside of South Korea’s territorial waters, but south of the Northern Limit Line, an oft-disputed maritime border between the two Koreas.

“President Yoon Suk-yeol noted North Korea’s provocation today was an effective act of territorial encroachment by a missile intruding the NLL for the first time since [the two Koreas’] division,” Seoul said in a statement.

The missile that landed off the South Korean coast was one of three short-range ballistic missiles fired into the Sea of Japan, South Korean military leaders said.

“Its reckless decision to fire a missile below the de facto maritime boundary with the Republic of Korea,” a US State Department spokesperson said, using the formal name for South Korea.

North Korea also fired over 100 rounds of artillery into a border buffer zone Wednesday.

The acts came after North Korean leadership in Pyongyang demanded an end to joint military exercises between South Korea and the US.

North Korea’s ballistic missile tests have increased in frequency and daring, recently, with an October launch sending a projectile over Japan.

The two Koreas are still technically at war — a 1953 agreement to end hostilities established a truce between the warring nations, but a peace treaty has yet to be signed.

With wires