North Korea is using Chinese-made trucks in a new mobile artillery system showcased five days ago, according to photographs reviewed by Reuters, underlining the difficulty in enforcing U.N. sanctions against the isolated state.

North Korea's Multiple Rocket Launcher System (MRLS) may be able to operate outside the range of similar U.S. and South Korean weapons, according to an expert.

In photographs published by North Korean state media, the vehicle used in the MRLS artillery battery has the bodywork and some markings of a Chinese-made Sinotruk HOWO truck, which is widely available commercially and is used by North Korea in its mining and construction industries.