North Korea has claimed another advance in its rocket arsenal. It says it has successfully tested a highly mobile type of missile.

FOX's Alastair Wanklyn in Tokyo:

North Korean state television showing a missile engine tested using solid fuel.

That's a potential advance over the slow-to-prepare liquid-fueled rockets Pyongyang already has, as they need to be tanked up before launch.

North Korea bragging about its weapons abilities this month. It recently showed a picture of what it said was a nuclear warhead.

Pyongyang also delivering bluster over new U.N. sanctions and joint U.S. military drills that are underway in South Korea.

In the Asia Bureau, Alastair Wanklyn, FOX News.