SEOUL, South Korea (AP) — North Korea is pressing ahead with preparation for a long-range rocket launch after extending its liftoff window by another week until Dec. 29 because of technical problems.

It’s North Korea’s second attempt this year, and the fifth since 1998, to launch a rocket that the United Nations, Washington, Seoul and others call a cover meant to test technology for missiles that could be used to strike the United States. They have warned North Korea to cancel the launch or face more sanctions.