North Korea said the satellite launched on saturday is now transmitting revolutionary songs while circling around the earth.

Tokyo requested an emergency session of the Security Council to call for a stern response to the launch, Japan’s U.N. spokesman Yutaka Arima said. The U.N. said it would meet Sunday afternoon in New York.

The South had put its 680,000-strong military on heightened alert against any border provocations by the North’s 1.2 million member armed forces, while Foreign Minister Yu Myung-Hwan said the launch breached Resolution 1718.