South Korea on Wednesday condemned North Korea for launching two intermediate-range ballistic missiles, calling the launch a clear violation of existing U.N. resolutions.

Earlier in the day, North Korea fired off what is believed to be two Musudan mid-range missiles from its east coast city of Wonsan.

"Relevant U.N. resolutions ban North Korea from using ballistic missile technology. North Korea's missile launches were clearly acts of provocation," Jeong Joon-hee, spokesman at Seoul's unification ministry, told a regular press briefing.

The South Korean military said of the two missiles launched, the first is presumed to have ended in failure. The second missile flew about 400 kilometers, but the military has yet to confirm whether it was a success.

Wednesday's back-to-back tests marked the communist country's fifth and sixth flight-tests of the Musudan missiles since April.

North Korea's previous four tests all ended in failure.

The Musudan missile, with an estimated range of some 3,000 to 4,000 kilometers, could theoretically fly as far as the U.S. territory of Guam. (Yonhap)