Experts: N.Korea may have used new rocket engine with Russian support

Experts in South Korea say North Korea may have used a new type of rocket engine introduced with Russian support in Monday's failed launch of what it claims was a military reconnaissance satellite.

North Korea's National Aerospace Technology Administration said early on Tuesday that a new rocket carrying a military reconnaissance satellite was launched on Monday night, but that it exploded in midair.

The Joint Chiefs of Staff of South Korea's military released footage on Tuesday taken by a patrol ship west of the Korean Peninsula the night before. The video shows a flash of light over the Yellow Sea, apparently due to an explosion.

In a preliminary conclusion, North Korea's aerospace agency attributed the failed launch to a new "liquid oxygen plus petroleum" engine.

South Korean experts suggest that the new engine uses kerosene along with liquid oxygen, and that it may have been hastily adopted with Russian technical support. Pyongyang used a different type of liquid fuel in the past.

South Korean media have quoted the country's government sources as saying that many Russian engineers have visited the North, and that engine combustion tests were repeatedly staged.

Experts say Russia may provide even more active support following the latest failed launch.