US President Barack Obama and South Korean President Park Geun-hye have spoke by telephone about North Korea's latest nuclear test, South Korea's presidential office says.
Obama and Park talked for fifteen minutes on Friday while Obama was on Air Force One on his way back to the US from a regional summit in Laos, according to the South Korean presidential office.
Park says North Korea's actions are in clear violation of UN Security Council resolutions and are a direct challenge to the international community.
The North's fifth nuclear test proved the country's leader Kim Jong Un's "maniacal recklessness" in completely ignoring the world's call to abandon his pursuit of nuclear weapons, Park was quoted as saying by her office.
