I've found another video showing cars in North Korea. It's a North Korean news report of South Korean President Roh Moo-hyun visiting Pyongyang in October last year. He rides in an open-top Mercedes limousine (W100 I think) with Kim Yong Nam, president of the Presidium of the North Korean Supreme People's Assembly. The motorcade contains several other Benzes along with two more unusual open-top cars, a ZiL 117 (I think) and a ZiS 110 (which perhaps was Kim Il Sung's parade car once upon a time).