SEOUL, South Korea — North Korea announced Saturday that it would attempt to launch a long-range rocket in mid-December, a defiant move just eight months after a failed April bid was widely condemned as a violation of a U.N. ban against developing its nuclear and missile programs.

The launch, set for Dec. 10 to 22, is likely to heighten already strained tensions with Washington and Seoul as the United States prepares for Barack Obama's second term as U.S. president and South Korea holds its own presidential election on Dec. 19.

This would be North Korea's second launch attempt under leader Kim Jong Un, who took power following his father Kim Jong Il's death nearly a year ago. The announcement by North Korea's space agency followed speculation overseas about stepped-up activity at North Korea's west coast launch pad captured in satellite imagery.