SEOUL, South Korea — North Korea said Saturday that it would try to launch another long-range rocket later this month, as the country prepares to commemorate the death a year ago of its longtime ruler Kim Jong-il, and as his son Kim Jong-un works to bolster his credentials as a leader.

The launching, which North Korea said would take place between Dec. 10 and Dec. 22, is likely to prompt international condemnations and heighten tensions with Washington and its allies. Critics consider North Korea’s launching of a Unha-3 rocket a cover for testing technology for intercontinental ballistic missiles that could eventually be used to carry nuclear weapons.

In April, North Korea launched a rocket, only to have it disintegrate shortly afterward, failing in its stated goal of putting an earth-observation satellite into orbit.

Saturday’s announcement came at a delicate time in the region. South Korea is gearing up for a presidential election on Dec. 19, and Japan plans parliamentary elections on Dec. 16. In Washington, President Obama will begin his second term in January.